Car, motorcycle & motorhome
I - Jump Starters / Battery boosters
Who hasn't struggled to start their car on a winter morning, battery too weak? Rather than asking for help, the simplest solution is the jump starter (or battery booster): a compact, very powerful lithium battery that restarts your engine in seconds. Essential in a car as in a motorhome, discover the very best.
Noco GB20 Boost Sport
See price and availability (53)
The smallest Noco, the one that genuinely fits in a motorcycle's underseat storage: 500 amps, about 2.2 lb (1 kg), and the same UltraSafe protection as its big brothers.
- Output: 500 peak amps (gas up to 4.0 L)
- Endurance: Up to 20 jump starts per charge
- Safety: UltraSafe, spark-proof and reverse-polarity proof
- Format: 7.7 x 3.1 x 1.7 in (196 x 80 x 43 mm), around 2.2 lb (1 kg), IP65
- Pocket format, for bikes and small gas-powered cars
The GB20 Boost Sport opens Noco's lithium jump starter range and targets a specific audience: riders, owners of small gas-powered cars, ATVs, riding mowers and leisure boats. Its 500 peak amps restart a gas engine of up to 4.0 liters with a completely flat battery, as many as twenty times on a single charge. It keeps what matters from the house: UltraSafe protection against sparks and reverse polarity, an IP65 sealed enclosure and a seven-mode LED light. A USB port also turns it into a backup battery for your phone.
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4.0/5
There is a classic mistake when buying a jump starter: reaching for the most powerful one out of reflex, when you actually own a city car or a motorcycle. The GB20 exists for those cases, and it covers them very well. Its 500 amps are ample to restart a four-cylinder gas engine of under four liters, which takes in almost the entire urban fleet, motorcycles, ATVs, jet skis and riding mowers. What you gain in exchange is the format: under 2 lb (under 1 kg), the size of a thick large phone, it genuinely fits under a motorcycle seat or in a door pocket, which a GB70 does not. And a jump starter you actually carry beats one left in the garage. Safety has not been trimmed for all that. UltraSafe protection is identical to the top of the range: spark-proof clamps, reverse polarity detection, no way of getting it wrong while connecting in the dark on a January morning. The IP65 enclosure shrugs off rain and dust, and the 100-lumen light with its seven modes, SOS and strobe included, earns its keep on an unlit roadside. Two limits to know before buying. The GB20 does not do diesel: Noco only certifies it for gas, and you need the GB40 or GB50 as soon as an oil burner is involved. Second, its 24 watt-hour battery stays modest as a power bank: it will rescue a phone, no more. At under eighty dollars it is the most honest entry ticket to Noco reliability.
Noco GB50 Boost XL
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The missing link between the GB40 and the GB70: 1500 amps, diesel up to 4.5 liters, thirty jump starts per charge, for barely more than the model below.
- Output: 1500 peak amps (gas 7 L, diesel 4.5 L)
- Endurance: Up to 30 jump starts per charge
- Safety: UltraSafe, spark-proof and reverse-polarity proof
- Lighting: 200-lumen LED light, 7 modes
- 4.5 L diesel for the price of a GB40
The GB50 Boost XL holds a strategic place in the Noco range: it adds 50 % more current than the GB40 without reaching the price or the bulk of the GB70. Its 1500 amps restart a gas engine up to 7.0 liters and, more to the point, a diesel up to 4.5 liters, which covers the family sedan, the SUV and the small van. Noco quotes up to thirty jump starts on a single charge. You still get UltraSafe spark-proof protection, the IP65 enclosure and an LED light raised to 200 lumens, twice as bright as on the models below.
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4.1/5
The GB50 is probably the best power-to-price ratio in the Noco range, and comparing it with its immediate neighbors makes that obvious. The GB40 below stops at 1000 amps and, crucially, at 3.0 liters of diesel: enough for a diesel city car, short as soon as a family sedan or an SUV is involved. The GB70 above climbs to 2000 amps but costs some fifty dollars more and weighs nearly twice as much. The GB50 slots between the two with 1500 amps, diesel certified to 4.5 liters, and a price that stays within touching distance of the GB40. For most European motorists, whose fleet is still heavily mid-capacity diesel, it is the model that lands exactly right. In use, the thirty-jump-starts claim is honest: we are of course talking about successive attempts on a very weak battery, not thirty breakdowns, but what it really means is that the unit keeps reserve after rescuing a neighbor too. The light raised to 200 lumens genuinely changes something: at 100 lumens you see your clamps, at 200 you see the engine bay. The rest is classic Noco, and that is a compliment: spark-proof clamps, reverse polarity protection, rubber-molded IP65 shell, USB port to rescue a phone. Two reservations. Like every Noco of this generation the charging input is 10 W USB-C only, so a full recharge takes several hours. And it does not handle 24 volts: for a truck or a tractor you have to leave this range. For everything else, there is very little to hold against it.
Noco GB40 Boost
See price and availability (140)
1000 amps in your glovebox to restart a dead battery: the UltraSafe NOCO GB40 forgives wiring mistakes and doubles as a power bank and a flashlight.
- Power: 1000A (gas 6L, diesel 3L)
- Safety: UltraSafe, spark-proof
- Functions: USB power bank, 100 lm LED light
- Protection: IP65, compact
- 1000A, UltraSafe, power bank + light
The NOCO Boost GB40 is a 1000 amp portable lithium jump starter that restarts a gas engine up to 6.0L or a diesel up to 3.0L, even with a completely dead battery. Its UltraSafe technology guards against sparks and reverse polarity, so you can connect it with confidence even if you have never jumped a car before. Compact and rugged (IP65 rated), it doubles as a USB power bank for your phone and a 100 lumen LED flashlight with several modes, including SOS. The go to rescue tool for the glovebox, the garage, or the trunk.
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4.2/5
The GB40 is one of those small gadgets that save your whole day. Dead battery on a cold morning, you grab it from the glovebox, clip on the clamps, and the car starts on the first try, no need to track down another driver for a jump. What we like most is the peace of mind: UltraSafe spark-proof and reverse-polarity protection means you can connect it without stress, even if you are not exactly a shade-tree mechanic. Its compact size makes it easy to stash anywhere, and the bonus features are genuinely useful: it can charge a phone in a pinch over USB, and the 100 lumen LED with SOS mode helps out on the shoulder of the highway at night. Two honest caveats: 1000 amps is plenty for a commuter car or a compact sedan, but a bit tight for a big diesel pickup (look at the GBX75 for that), and you need to keep it charged so it is ready when you need it. For the vast majority of drivers, it is a smart, reassuring buy.
Noco Boost GB70
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The jump starter that shrugs off big engines: the NOCO GB70 delivers 2000 amps to restart a gas engine up to 8.0L or a diesel up to 6.0L, safely.
- Peak current: 2000A
- Engines: Gas 8.0L / Diesel 6.0L
- Battery: 56 Wh lithium, ~40 starts
- Extras: 400 lm light, USB power bank, IP65
- 2000A for big engines with UltraSafe safety
The NOCO Boost GB70 is a 12V lithium jump starter rated at 2000 amps, built for big engines: gas up to 8.0L and diesel up to 6.0L. Its UltraSafe technology protects against reverse polarity and sparks, real peace of mind for beginners. Its 56 Wh battery allows up to 40 jump starts per charge and doubles as a USB power bank to recharge a phone or tablet. It packs a 400 lumen LED light with SOS and strobe modes, and a rugged IP65 rated housing. A versatile standalone jump starter for cars, SUVs, trucks, or boats.
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4.1/5
The NOCO GB70 is the kind of accessory you toss in the trunk hoping you never need it, and that becomes a lifesaver the day the battery finally gives out. We tested it on a 2.2L diesel in cold weather with a fully dead battery: clamps connected the right colors to the right terminals, green light, and the engine fired on the first crank. The 2000 amp margin is reassuring, you can tell it has headroom to spare even on a big block. What we appreciate most is the UltraSafe protection: reverse-polarity and spark protection takes all the stress out of connecting, even for someone who does not do this often. The build is tough, the IP65 housing shrugs off garage dust and damp, and the 400 lumen light genuinely helps at night on the shoulder of the road. As a nice bonus, it works as a USB power bank to top off a phone. The only downsides: it is a bit heavy at around 5.1 lb (2.3 kg), and a full recharge over USB-C is not exactly fast. But for the peace of mind it buys, it is an investment we recommend without hesitation.
II - 12V → 220V converters
Need to run a mains appliance from the cigarette lighter of your vehicle or motorhome? A voltage converter (or inverter) turns 12V into 220V and makes it possible. Be sure to size the power correctly for the appliance you want to run. Here is our selection of the best converters.
Bestek 200W Power Inverter
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Plugs into any 12V outlet and puts out true 120V household power, with fast USB-C and USB-A charging built right into the same compact unit.
- Power: 200W continuous, 500W peak
- Outlets: 2x 120V AC outlets
- USB: 30W USB-C, 18W USB-A
- Certification: ETL listed
- Fast USB-C and USB-A charging built in
This compact Bestek power inverter plugs straight into a car, truck, or RV 12V outlet and converts it into 120V AC household power, enough to run a laptop charger, small electronics, or basic tools rated up to 200 watts continuous (500W peak). Alongside its two AC outlets, it packs a 30W USB-C port and an 18W USB-A port for fast device charging without needing the AC side at all. ETL listed for safety, it is a favorite pick-up for road trips, tailgating, storm prep, and anyone who wants a wall outlet on the go.
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3.7/5
We kept this Bestek inverter clipped into a truck's 12V outlet for a month of errands and one genuine road trip, and it earns its keep as the small backup that quietly does its job. Plugging in a laptop charger and a portable fan at the same time never tripped the 200-watt rating, and the USB-C port pulled a real 30 watts into a phone, fast enough to matter on a long drive. The dual AC outlets are a nice touch over the single-outlet inverters we have tried, letting two low-draw devices run at once. Build quality feels solid for the price, and the ETL listing is reassuring given how many uncertified inverters show up online. Our one real complaint: the 500-watt peak is brief, so anything with a real motor, like a small blender, trips the overload protection almost immediately. It also gets warm under sustained load, so airflow around it matters. For phones, laptops, and small electronics on the road, in a car, or during a power outage, it is a dependable, inexpensive piece of kit worth keeping in the glovebox.
Victron Energy Phoenix 12/500
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The inverter you fit once for a decade: true pure sine wave, an ECO mode that draws a single watt on standby, and five years of manufacturer warranty.
- Output: 400 W continuous at 77 °F (25 °C), 900 W peak
- Waveform: True pure sine wave, adjustable 230 V
- Standby: ECO mode, 1 W draw
- Monitoring: VE.Direct port, remote on/off
- True pure sine wave and a 5-year warranty
The Phoenix 12/500 VE.Direct is the entry model in Victron Energy's inverter range, from a Dutch manufacturer whose equipment is found on boats, motorhomes and off-grid installations alike. It delivers 400 watts continuous at 77 °F (25 °C) and absorbs 900 watt peaks, in genuine pure sine wave. Its ECO mode drops it to standby at a single watt when nothing is plugged in, and its VE.Direct port lets you configure and monitor it from a phone.
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4.5/5
There are two families of 12 volt inverter, and the difference is not obvious in a shop. Modified sine wave models, the vast majority below a hundred pounds, produce a stepped approximation of mains current. That is fine for a lamp or a drill, but it makes transformers hum, motors run hotter and upsets some switched-mode power supplies. The Phoenix 12/500 belongs to the other family: it produces a genuine sine wave, indistinguishable from a wall socket, so it can run a medical device, a sewing machine, a tool charger or a computer power supply without reservation. The second thing that sets it apart is ECO mode. A conventional inverter draws current permanently, often five to ten watts, even with nothing plugged in: on a motorhome battery that empties a hundred amp-hours in a few weeks. The Phoenix instead drops to one watt on standby and wakes as soon as a load above fifteen watts appears. On an installation left permanently connected, that detail is the difference between a battery still charged in spring and a dead one. The VE.Direct port completes the picture: with a Bluetooth dongle you set the low-voltage cut-off thresholds, the output voltage and ECO mode from a phone. Two honest limits. The 400 continuous watts are reached quickly: enough for a laptop, a television, a charging station or a small fridge, but not a kettle or a microwave. And the price stays three to four times that of a modified sine unit of equivalent rating. What you pay for is signal quality, standby draw and a five-year warranty.
Victron Energy Phoenix 12/1200
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A thousand watts of true pure sine power from a 12-volt battery: the go-to inverter for RV owners and boaters, backed by a 5-year warranty.
- Output: 1000W continuous, 2200W peak
- Waveform: True pure sine wave, 120V/60Hz
- Standby: ECO mode, 1W draw
- Format: 16.3 lb (7.4 kg) (16.3 lbs), NEMA GFCI outlet
- The pure sine wave that runs nearly anything
The Phoenix 12/1200 VE.Direct is the inverter that upgrades a 12-volt system to real household comfort: 1000 watts continuous at 77 °F (25 °C), 850 watts at 104 °F (40 °C), and up to 2200 watts of peak power to absorb a motor or compressor starting up. The output is a genuine pure sine wave from a toroidal transformer, and ECO mode drops standby draw to a single watt. A NEMA outlet with built-in GFCI protection and the VE.Direct port for phone-based monitoring round out a unit built for a permanent RV or marine installation.
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4.5/5
A thousand continuous watts is where an inverter stops being a stopgap and becomes a real onboard power supply. Below that you charge gadgets; here you run a coffee maker, an entry-level microwave, a power tool, or a compressor fridge without a second thought. The 2200-watt peak matters just as much: it absorbs the surge of a motor starting, the exact moment cheaper inverters trip their own protection. The Phoenix produces a true pure sine wave through a toroidal transformer, an older but proven design Victron has stuck with over lighter electronics. That explains the 7.4-kilo weight, and the reputation these units have for surviving the heat and vibration of a boat engine room for years. ECO mode is the feature buyers underrate at first and rely on afterward: one watt of standby instead of ten adds up over a season. The built-in GFCI protection is a genuine plus near water. Two honest notes: the price is real money next to a cheap modified-sine box, and battery sizing matters, since 1000 watts out draws close to 90 amps at 12 volts.
Victron Energy Phoenix 12/2000
$726.64
1600 watts of true pure sine power from a 12-volt battery, at 230V: Victron's flagship Phoenix, built for European-spec gear rather than standard US outlets.
- Output: 1600W continuous, 4000W peak, 230V
- Waveform: True pure sine wave
- Standby: ECO mode, 0.6W draw
- Format: 28.7 lb (13 kg), IP21
- Victron's most powerful Phoenix, but 230V output
The Phoenix 12/2000 VE.Direct Smart is the most powerful of Victron's 12-volt Phoenix inverters: 1600 watts continuous at 77 °F (25 °C), 1450 watts at 104 °F (40 °C), and up to 4000 watts peak. It is a genuine pure sine wave unit built around a toroidal transformer, with ECO mode dropping standby draw to 0.6 watt and built-in Bluetooth for setup. One important note for US buyers: this model outputs 230V AC, the European standard, not the 120V used by US household circuits and most RV or boat outlets.
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4.6/5
Worth saying upfront: this is the European-spec Phoenix 12/2000, and it puts out 230V AC, not the 120V that US wall outlets, most RV pedestals, and the vast majority of American appliances expect. If you plug a US device into it, at best it does nothing, at worst you damage the device. Victron does sell this exact unit in the UK, Germany, and the rest of Europe, and it genuinely is the flagship of the 12-volt Phoenix range there: 1600 watts continuous, a 4000-watt surge rating, and the same toroidal-transformer build quality that has made Victron's name in the marine and overlanding world. In the US, Victron's standalone Phoenix Smart lineup caps out at 1600VA/120V; anyone wanting more standalone inverter power at 120V in the US market is steered toward the MultiPlus inverter/chargers instead, which bundle in a battery charger and transfer switch at a substantially higher price point. So who actually wants this 230V unit stateside? Mostly boat owners and overlanders running genuinely dual-voltage systems, or anyone who has imported 230V equipment (some European appliances, certain welding gear, some marine electronics) and needs a clean, high-power source for it specifically. For a standard US RV, van, or home backup setup that just needs to run American 120V appliances, this is the wrong product; look at Victron's own 120V Phoenix lineup or a MultiPlus instead.
Victron Energy Phoenix 24/1600 Smart
$909.42 $699.55
The Victron Phoenix 24/1600 Smart inverter moves a 24 volt installation into domestic comfort, with a true pure sine wave and built-in Bluetooth.
- Output: 1300 W continuous at 77 °F (25 °C), 3000 W peak
- Waveform: True pure sine wave, built-in Bluetooth
- Battery voltage: 24 V, input range 18.6 to 34 V
- Format: 26.5 lb (12 kg), IP21
- Built-in Bluetooth, full setup from VictronConnect
The Phoenix 24/1600 Smart is the inverter that moves a 24 volt installation into domestic comfort: 1300 watts continuous at 77 °F (25 °C), 1200 watts at 104 °F (40 °C), and up to 3000 watts peak to absorb a motor or compressor starting. The signal is a genuine pure sine wave produced by a toroidal transformer, and Bluetooth is built into the enclosure: all configuration and monitoring happen from the VictronConnect app, with no dongle or extra cable needed.
We fitted this Phoenix 24/1600 Smart to a 24 volt service bank, curious about what really changes when you move up from our usual 12V setups. First observation: for the same power, the current drawn from the battery is half what it would be at 12V, which noticeably eases the cable gauge needed up to the M8 terminals. The built-in Bluetooth delivers on its promise: instant pairing with VictronConnect, settings reachable in a few taps, including the ECO mode threshold we had to raise to stop it cutting power to a small charger left plugged in. The pure sine output caused no trouble at all, even with a small compressor that is normally hard to start. The steel enclosure feels reassuring, but its 26.5 lb (12 kg) are worth planning for when mounting it. Only real drawback: unlike the VE.Bus Compact version, a touch cheaper and lighter, this Smart model cannot be run in parallel or three-phase, a limit worth knowing if the installation might grow later. For a standalone 24V setup, it is hard to beat at this price point.
Renogy 1000W/2000W power inverter
$230.17 $148.93
(6)
From cigarette lighter to a real mains socket: the Renogy inverter keeps sensitive electronics powered, with an automatic mains transfer switch in 50ms.
- Power: 1000W continuous, 2000W surge
- Waveform: Pure sine wave, 220-240V
- UPS function: Mains/battery switch in 50ms
- Format: 5.7 lb (2.6 kg), wired remote included
- True pure sine wave with automatic mains switch
The Renogy 1000W/2000W inverter turns a battery's 12V into 230V pure sine wave AC, clean enough for sensitive electronics such as laptops, medical devices or small appliances. Its UPS function automatically switches between mains and battery power in under 50 milliseconds, a genuine asset in a motorhome, on a boat, or as home backup power. Compact at 5.7 lb (2.6 kg), protected against overload and overheating, it also comes with a wired remote control.
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4.1/5
You would expect a lot from an inverter priced around $148.94 and this one mostly delivers. The genuine pure sine wave causes no issues with a laptop, a power tool charger or a small kettle, unlike modified sine models that make some appliances hum. The UPS function is the real selling point: wire the AC input to your motorhome's shore power and let the unit switch itself over on a power outage, no scrambling to swap plugs. A couple of honest caveats. The rated idle draw (about 1A, or 12W) is higher than a Victron in ECO mode, which matters on a setup left plugged in for weeks. The supplied battery cable is decent but no more: consider upgrading it if you plan to draw the full 1000W continuously. For the price, well below an equivalent pure sine inverter with a built-in transfer switch, it is a genuinely good compromise for a reliable 230V socket without breaking the bank.
Bestek 500W power inverter
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500W of 220V in the car: the Bestek inverter turns your cigarette lighter or 12V battery into a mains socket to power small devices and charge on the road.
- Power: 500W continuous (higher peak)
- Conversion: 12V DC to 220-240V AC
- Outputs: Mains socket(s) + USB ports
- Safety: Cooling fan, electronic protections
- 500W, mains sockets + USB, portable
The Bestek 500W inverter turns the 12V direct current of your car, motorhome or boat into 220-240V alternating current, like a household mains socket. With 500W of continuous power (and a higher peak reserve), it powers small everyday devices: laptop, small appliances, light tools, chargers. It usually combines mains sockets and USB ports to charge phones and tablets at the same time. Compact, with a cooling fan and electronic protections, it is a handy accessory to stay powered on the move.
The Bestek 500W inverter does the job you expect from a portable inverter: it turns the 12V of the car or a battery into a real 220V socket, which genuinely helps out on the move. You plug in a laptop charger, a small appliance or light tools, and the USB ports charge phones and tablets in parallel, handy on a road trip or a worksite. The cooling fan kicks in under load and the electronic protections (overload, over-temperature, short circuit) are reassuring. You do need to keep in mind the limits of this type of product: 500W suits small devices, not large appliances or very power-hungry motors, and the cigarette-lighter supply is current-limited, so it is better to connect directly to the battery with the clamps to use the full power. Also take care not to drain the vehicle battery with the engine off. To power small 220V gear far from a socket, it is a simple, useful accessory.
III - Battery testers
Need to know more about the state of health of your vehicle battery (or your solar kit battery)? A good battery tester gives you valuable information in seconds: charge level, voltage, state of health. Enough to anticipate a breakdown rather than suffer it. Here is our selection of testers.
Motopower MP0514B
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Discover the Motopower MP0514B, a digital 12V battery tester and analyzer, very complete, with a 4-digit numeric display.
- Type: Digital battery tester
- Dimensions: 4.6 x 3.6 x 2 in (117 x 91 x 51 mm)
- Weight: 5.3 oz (150 g)
- Voltage range: 4-20V
- Multifunction, accurate and easy to use
The MP0514B is a digital 12V battery tester and charging system analyzer, offered by manufacturer Motopower. Equipped with an LCD screen, it gives you the information you need about your 12V car battery (voltmeter accepted range: 4V to 20V). Protected against polarity reversal and overvoltage, this tester will show you your battery's level and whether it is dead or not. Very practical!
Konnwei KW208
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A complete, affordable car battery tester: it checks battery health, the cranking circuit, and alternator charging, from 100 to 2000 CCA.
- Compatibility: 6V / 12V batteries (flooded, AGM, EFB, gel)
- Test range: 100 to 2000 CCA
- Functions: Battery health, cranking, alternator charging
- Complete 3-in-1 diagnosis, LCD screen, budget friendly
The KONNWEI KW208 is a car battery tester that does a lot for the money. Clipped onto a 6V or 12V battery with its clamps, it reads the battery's state of health (remaining capacity, internal resistance, voltage) across a 100 to 2000 CCA range, plus the cranking circuit and alternator charging. Results show clearly on its backlit LCD screen. Compatible with standard flooded, AGM, EFB, and gel lead-acid batteries, it is a simple, reliable diagnostic tool for drivers and shops alike.
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4.0/5
For a tester at this price, the KW208 earns its keep. We used it on several vehicles before winter, and it gives a clear reading in a few seconds: battery health as a percentage, voltage, and a CCA estimate to compare against the number printed on the battery. The real advantage over a plain voltmeter is that it also tests the starter draw and the alternator's charging output: you can immediately tell whether the battery is worn out or the alternator is not charging enough. Hooking up to the terminals is straightforward with the clamps, and the backlit screen stays readable under the hood. We like being able to select the battery type (standard flooded, AGM, EFB, gel) for a consistent result. It is not a high-end shop tool, the interface is basic and the translated text is occasionally rough around the edges, but for diagnosing a weakening battery yourself before replacing it blindly, it is remarkably useful and pays for itself fast.
Topdon BT100
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Know in 3 seconds if your battery needs replacing: the TOPDON BT100 tests health, charge, cranking, and alternator with a single click, from 100 to 2000 CCA.
- Compatibility: 12V batteries (flooded, AGM, EFB, gel)
- Test range: 100 to 2000 CCA
- Tests: Battery, cranking, charging system
- Display: 128x64 LCD screen
- 3 tests in one, clear results from 100 to 2000 CCA
The TOPDON BT100 is a compact 12V battery tester that reads battery health (SOH), state of charge (SOC), voltage, and internal resistance. Thanks to conductance technology, it also tests the cranking system and the charging system (alternator), across a 100 to 2000 CCA range. Compatible with every 12V battery type (flooded, AGM flat plate and spiral, EFB, gel), it shows clear results on its LCD screen and includes reverse polarity protection.
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4.1/5
The TOPDON BT100 is one of those small tools that save a lot of hassle. We used it on a car that struggled to start in the morning: within seconds, it confirmed the battery was at the end of its life, health collapsed, before we even pulled it to replace it. What we like is that it does not just show a voltage: it gives a real health percentage, tests cranking capacity, and checks the alternator too, so you know right away whether the problem is the battery or the charging system. The LCD screen is easy to read, the clamps are solid, and the unit runs without its own batteries since it draws power from the battery under test. You just need to enter the right standard and CCA rating for an accurate result. At this price, it is an excellent diagnostic tool to keep in the glovebox, as useful for the careful DIYer as for the weekend mechanic.
Autel MaxiBAS BT506
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The battery tester that thinks like a pro: the Autel MaxiBAS BT506 diagnoses battery, cranking and alternator with workshop accuracy, driven from your smartphone.
- Compatibility: 6V / 12V (flooded, AGM, EFB, Gel)
- Test range: 100 to 2000 CCA
- Tests: Battery, cranking, alternator
- Interface: Free iOS/Android app (Bluetooth)
- Adaptive conductance, workshop accuracy via smartphone
The Autel MaxiBAS BT506 is a 6V and 12V battery and electrical system analyzer, using adaptive conductance technology for highly accurate diagnostics. It tests the battery (health, charge), the starter and the alternator, in and out of the vehicle, over a 100 to 2000 CCA range. Compatible with all technologies (flooded, AGM, AGM spiral, EFB, Gel) and many standards (CCA, EN, DIN, JIS...), it is driven via a free iOS and Android app over Bluetooth, with clear, detailed results.
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4.1/5
The Autel MaxiBAS BT506 plays a level above small garage testers. We used it on several vehicles, and its adaptive conductance technology gives genuinely reliable results, close to what far pricier workshop tools show. What we like is the comfort of the app: the unit connects to the smartphone over Bluetooth, and you get a clear, colorful report with health status, cranking capacity and alternator check, all in under a minute and with no subscription. Being able to test the battery out of the vehicle is also very handy for second-hand parts. The unit is well finished, the clamps sturdy. The only things to note are a price above a plain screen tester, and having to go through the phone. But for a demanding home mechanic or a small workshop, it is a remarkably accurate and complete analyzer.
IV - Motorcycle batteries
Leave a motorcycle in the garage all winter and it is the battery that picks up the bill in spring. Unlike a car, a two-wheeler is ridden little, recharges poorly and suffers in the cold: its battery typically needs replacing every three to four years. Picking the right reference (YTX, YTZ, size, polarity, cranking amps) is essential, and brand quality genuinely shows in service life.
Yuasa YTX7L-BS 12V 6 Ah
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The small battery fitted to half the 125s and scooters on European roads: tall and narrow, 100 cranking amps, and the seriousness of an original-equipment maker.
- Capacity: 12 V, 6 Ah (100 cranking amps)
- Technology: Sealed AGM, pre-activated, maintenance free
- Format: 4.5 x 2.8 x 5.2 in (115 x 72 x 132 mm), 5.5 lb (2.5 kg)
- Polarity: Positive terminal on the right
- The reference for 125s and city scooters
The YTX7L-BS is the reference for small capacities: 125 cc road and trail bikes, city scooters, entry-level quads and compact jet skis. Its tall, narrow 4.5 x 2.8 x 5.2 in (115 x 72 x 132 mm) format sets it apart from the wider YTX references and rules out any mix-up at fitting. It delivers 12 volts, 6 amp-hours and 100 cranking amps in sealed maintenance-free AGM technology. Supplied factory-activated, it fits straight out of the box, which is not true of the whole range.
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4.2/5
On a 125 or a scooter, the battery sits in a compartment sized to the millimeter, often under the seat or behind a side panel. The YTX7L-BS answers that exact format: it is tall and narrow where the YTX9-BS is low and wide, and the two are not interchangeable despite similar capacities. That is the first thing to check before ordering, and the reason this standardized reference exists at all. On substance you get the qualities that made Yuasa's name: it is the maker supplying a good share of Japanese manufacturers as original equipment, and its plates go the distance where compatibles sold at twenty-five pounds lose capacity by their second season. The 100 cranking amps are ample for a 125 cc single, cold mornings included, provided the battery is charged. One practical detail sets it apart from the rest of the range: in the version we selected it ships factory-activated, with no acid bottle to pour. Out of the box, connected, ridden. That is welcome on a two-wheeler where reaching the battery often means removing bodywork. Two reservations that are barely reservations. Six amp-hours is little: on a scooter fitted with an alarm or heated grips, the reserve drains fast if journeys are short. And like every small-capacity battery, it hates being laid up unattended. A trickle charger connected from November to March costs a third of a new battery and buys it two extra years.
Yuasa YTX9-BS 12V 8.4 Ah
See price and availability (18)
The factory-fit reference on many mid-size motorcycles and maxi-scooters: sealed AGM, 135 cranking amps, and the reliability of a century-old maker.
- Capacity: 12V, 8.4Ah (135 cranking amps)
- Technology: Sealed AGM (VRLA), maintenance free
- Size: 5.9 x 3.4 x 4.1 in (150 x 87 x 105 mm), 6.8 lb (3.1 kg)
- Polarity: Positive terminal on the left
- The original fitment on 600s and maxi-scooters
The YTX9-BS is an industry-standard battery size: it shows up on a large share of 600cc sport and standard motorcycles, on maxi-scooters, ATVs, and personal watercraft. Yuasa is its original designer, and Yuasa is the company that supplies most Japanese manufacturers as original equipment through its US operation, Yuasa Battery Inc. Sized 5.9 x 3.4 x 4.1 in (150 x 87 x 105 mm), 12 volts, 8.4 amp-hours, and 135 cold cranking amps, in sealed AGM technology: no maintenance, no fluid level to check, and solid resistance to vibration.
Buying a motorcycle battery is rarely fun: you replace it because the old one gave up, usually at the worst possible moment. Better to get the right one the first time, and the Yuasa YTX9-BS is hard to fault. The first argument is industrial, not technical: Yuasa is the original designer of the YTX reference, the same company that fits a large share of Japanese motorcycles from the factory through its US arm, Yuasa Battery Inc. Buying a YTX9-BS means buying exactly what the manufacturer installed, where cheaper compatible copies match the dimensions but rarely the service life. On the technical side, the 135 cold cranking amps matter most, not the amp-hour rating, since that number decides whether the starter spins convincingly on a cold morning. Sealed AGM technology removes the maintenance and handles vibration well. Two honest notes: the battery ships with a separate acid pack to fill at installation, needing a full charge first, and like any lead-acid battery it hates sitting dead, so a trickle charger during winter storage is the best investment you can make alongside it.
Yuasa YTX14-BS 12V 12 Ah
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Two hundred cranking amps: the reference battery that spins big twins, cruisers, and adventure bikes where a YTX9 begins to struggle.
- Capacity: 12V, 12Ah (200 cranking amps)
- Technology: Sealed AGM (VRLA), maintenance free
- Size: 5.9 x 3.4 x 5.7 in (150 x 87 x 145 mm), 10.1 lb (4.6 kg)
- Polarity: Positive terminal on the left
- 200A, the reference for big-bore bikes
The YTX14-BS is the battery for big-bore machines: cruisers, adventure bikes, sport tourers, utility ATVs, and recreational boats. Its 200 cold cranking amps are half again what a YTX9-BS delivers, and its 12 amp-hours absorb the constant draws of a modern motorcycle, alarm and heated grips included. Sealed maintenance-free AGM technology, a 5.9 x 3.4 x 5.7 in (150 x 87 x 145 mm) case weighing 10.1 lb (4.6 kg), positive terminal on the left.
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4.3/5
On a big-bore machine the battery works far harder than on a 125. It has to spin a twin over a liter of high compression, often after weeks parked. That is the job of the YTX14-BS, and the number that matters is not its 12 amp-hours but its 200 cold cranking amps, half again what a YTX9-BS puts out and the difference between a starter that turns over weakly and an engine that fires on the first try on a cold October morning. Sealed AGM technology suits this well: cruisers and adventure bikes vibrate, run hot, and tilt their battery inside tight housings, and electrolyte held in a glass-fiber separator does not leak and handles shaking better than a flooded battery. The 4.6 kilos simply reflect how much lead it takes to deliver those 200 amps. Two things worth knowing: the battery ships dry, so a full charge is required after activation and before first use, and the YTX14-BS is not the same as the YTX14H-BS or YTX14AHL-BS despite the similar names, since dimensions differ. On a bike that sits over winter, a trickle charger is the best way to protect the ninety dollars invested here.
V - Alternator chargers
Driving alone is not enough to properly charge a large lithium leisure battery: the stock alternator quickly plateaus, especially on short trips. An alternator (DC-DC) charger makes full use of the current available while driving to charge a motorhome or van's leisure battery, without draining the starter battery. Here is our selection of the best alternator chargers.
Renogy DCC50S
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Recharge your house battery while driving AND from the sun: the Renogy DCC50S packs a 50A DC-DC charger and MPPT solar controller in one unit, built for vans.
- Charge current: 50A (12V)
- Inputs: Alternator + solar (built-in MPPT)
- Power / efficiency: 660W, up to 94%
- Compatibility: Lead-acid (flooded, gel, AGM), lithium LiFePO4
- 50A DC-DC charger and solar MPPT in a single unit
The Renogy DCC50S is a 12V dual-input on-board battery charger delivering 50A. It recharges the auxiliary (house) battery of a van or camper from the vehicle's alternator and/or from solar panels, thanks to a built-in MPPT controller. With 660W of power and 94% efficiency, it works with lead-acid (flooded, gel, AGM) and lithium LiFePO4 batteries. Its voltage-sensitive relay (VSR) isolates the two batteries, and an optional Bluetooth module allows monitoring through the app.
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4.2/5
The Renogy DCC50S is one of the key pieces of gear in a converted van, and in use it delivers on its promises. We installed it to recharge an auxiliary lithium battery, with one input from the alternator and another from roof-mounted solar panels. The result is impressive: while driving, the house battery recharges at 50A, far faster than with a simple battery isolator, and once parked, the MPPT controller takes over with solar. Having both functions in a single unit greatly simplifies the install and the wiring. The voltage-sensitive relay cleanly isolates the starting battery, so you are not staring at a dead battery the next morning. Adding the optional Bluetooth module lets you monitor charging from the app, which is genuinely handy. Points to plan for: you need to size the cables properly, since 50A is a lot of current, and set the correct battery profile, and on a smart alternator an ignition wire is required. But for a serious van or 4x4 build, this is a safe bet.
Renogy RBC40D1U-BT2
$186.99 (10)
The Renogy RBC40D1U-BT2 charges your leisure battery at up to 40A from the alternator. No solar MPPT, unlike the DCC50S, and Bluetooth is sold separately.
- Charge current: 40A adjustable (40/30/20/10A)
- Input: Alternator only, no solar MPPT
- Bluetooth: BT-2 module sold separately
- Compatibility: Lead-acid (AGM, Gel, flooded), lithium LiFePO4
- Adjustable up to 40A, no solar MPPT, compact 4.1 lb design
The Renogy RBC40D1U-BT2 is a 12V onboard DC-DC charger with output adjustable across 4 levels (40A, 30A, 20A or 10A), designed to charge the leisure battery of a van, RV or 4x4 from the vehicle's alternator. In the US, the Bluetooth BT-2 module is sold separately for live charge monitoring via the Renogy DC Home app. Compatible with lead-acid batteries (AGM, Gel, flooded) and lithium LiFePO4, it reaches 94% charging efficiency. Unlike the DCC50S from the same range, it has no built-in solar MPPT controller: it's a pure alternator charger, with no solar panel input.
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4.3/5
We fitted the RBC40D1U-BT2 in a converted van to charge a lithium leisure battery, set to its 40A output. On the road, charging is fast and noticeably stronger than a simple battery-to-battery relay. Here in the US, the Bluetooth BT-2 module is sold separately rather than bundled in, worth budgeting for if you want app monitoring: once added, the DC Home app shows current, voltage and battery type live, handy for checking the install without popping the hood. On a vehicle with a smart alternator, we had to wire the IGN signal lead to trigger charging, otherwise nothing happens, worth planning for before buying. The one real downside for van or RV use: no built-in solar controller, unlike the DCC50S from the same brand, so you'll need a second device if solar panels are also planned. For anyone who only needs the alternator, the RBC40D1U-BT2 gets the job done without complication.
EcoFlow Alternator Charger Plus 1000
$445.47 (4)
Up to 1000 W from the alternator while driving: the DC-DC charger with a dedicated solar port and reverse charging, that never drains the starter battery.
- Alternator charging: 1000 W max, up to 75 A (12V/24V input)
- Starter battery maintenance: 100 W, protects the starter battery
- Reverse charging: Up to 75 A, tops up the starter battery if needed
- Connectivity: Wi-Fi and Bluetooth, EcoFlow app
- Simultaneous alternator + solar charging, up to 1000 W
The EcoFlow Alternator Charger Plus 1000 is a DC-DC charger that taps the alternator's current while driving to charge a motorhome or van's leisure battery at up to 1000 W, roughly 10 times faster than a cigarette lighter socket. A dedicated solar port lets you combine alternator and solar charging at the same time without tying up the power station's XT60 port. A maintenance mode protects the starter battery, and a reverse-charging mode can even top it up from the station if needed. Compact at 3.7 lb (1.7 kg) and controlled over Wi-Fi and Bluetooth via the EcoFlow app, it includes a 125A fuse and comprehensive protection.
The Alternator Charger Plus 1000 genuinely changes the game for anyone who drives a lot in a motorhome or van: no more waiting hours to charge a large leisure battery, up to 1000 W flows straight from the alternator while driving. The real highlight is the dedicated solar port: you can plug in panels in parallel without tying up the station's XT60 port, combining both sources even while parked. Reverse charging is a welcome safety net, able to top up the starter battery from the station if needed, without ever draining it by mistake. Full Wi-Fi and Bluetooth control through the EcoFlow app lets you check the active mode without popping the hood. Compact and light at 3.7 lb (1.7 kg), it installs easily near the battery. Our one reservation: you need a compatible EcoFlow power station to get the full benefit.
Sterling Power BB1230
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Charge your house battery up to 20 times faster than a basic split-charge relay: the Sterling Power BB1230 boosts current from smart alternators too.
- Charge current: 30 A (12V)
- Battery profiles: 9 presets: AGM, LiFePO4, Gel, lead-acid
- Input: 11-20V, smart Euro 5/6+ alternators
- Protection: IP21, spark-free, OEM lock
- 30A without touching the alternator, 9 battery profiles
The Sterling Power BB1230 is a 12V 30A battery-to-battery (B2B) charger, built to quickly recharge the house battery of a camper van, RV or boat straight from the vehicle's alternator. With 9 preset charge profiles (AGM, LiFePO4, Gel, flooded and sealed lead-acid) and compatibility with smart Euro 5/6+ alternators, it installs without touching the alternator or voiding its warranty. An optional remote display is available.
We wired the BB1230 between the starter and house batteries of a converted van, following the supplied diagram: nothing to touch on the alternator side, just two hefty cables and the recommended fuses (50A for a 30A input, wire it thin and it runs hot). The result is clear: the house battery tops up far faster than with a basic relay, and the LiFePO4 profile suited our lithium battery perfectly. The small box stays out of sight under a seat, with a fan you can hear under full load without it being unbearable. The part that takes patience is programming a custom profile: buttons and LEDs do the job, but the interface is far from intuitive at first, you have to follow the manual step by step. On a recent smart alternator, budget for running an ignition-sense wire too, for reliable charge triggering. For a van or boat that just needs a real boost from the alternator, without necessarily adding solar, it is a solid and notably cheaper option than rivals at the same current.
VI - Battery monitors
A charger or a booster doesn't tell you everything: how much is really left in the battery, right now? A battery monitor (a shunt wired to a display, sometimes to a Bluetooth app) continuously measures voltage, current and state of charge, well beyond a one-off check. Essential as soon as a leisure battery powers a van, a boat or a fixed solar setup. Here is our selection of the best battery monitors.
Renogy RBM500
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The Renogy RBM500 continuously tracks voltage, current and state of charge through a 500A shunt and a wired LCD display, accurate to within 1%.
- Shunt: 500A, 10-120V range
- Accuracy: ±1% (current, voltage, capacity)
- Display: Backlit wired LCD (20 ft cable)
- Compatibility: Lead-acid (AGM, Gel), lithium LiFePO4, NiMH
- 1% accuracy and 20 ft cable, no built-in Bluetooth (BT-2 optional)
The Renogy RBM500 is a shunt-based battery monitor capable of measuring up to 500A across a 10V to 120V voltage range, with 1% accuracy on current, voltage and capacity. Its backlit wired LCD display (20 ft shielded cable) shows voltage, current, power consumption and remaining charge percentage live. Compatible with lead-acid batteries (AGM, Gel), lithium LiFePO4 and NiMH, it has no built-in Bluetooth: the separately-sold Renogy BT-2 module is required for smartphone monitoring.
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3.5/5
We fitted the RBM500 to a setup with a 200Ah lithium leisure battery, keen to finally know what's really going on inside it, beyond a basic voltmeter reading. The shunt wires in once, on the negative terminal, and the LCD display, connected via a 20 ft shielded cable, can be mounted well away from the battery, on a dashboard for instance. The result: live readout of voltage, current and, most usefully, remaining charge percentage, far more meaningful than raw voltage alone. Over time, the claimed 1% accuracy held up well against a reference multimeter. The one thing to know before buying: this monitor has no Bluetooth at all, despite what the price might suggest. For smartphone monitoring, you need to add Renogy's BT-2 module, sold separately. For anyone happy with the physical screen, often plenty for RV use, the RBM500 does the job well at a fair price.
Victron Energy BMV-712 Smart
$158.95 (25)
The Victron BMV-712 Smart shows voltage, current and remaining charge on its own display, with no need for a phone nearby, plus Bluetooth on top.
- Display: Blue backlit LCD, dedicated
- Shunt: 500 A/50 mV, up to 9999 Ah
- Bluetooth: Built-in, programmable AUX input
- Power supply: 6.5 to 70 V, IP55
- Dedicated physical display: direct reading without a phone
The BMV-712 Smart is Victron's reference battery monitor: a 500 A/50 mV shunt paired with a dedicated backlit LCD display, showing voltage, current, state of charge and remaining runtime at a glance, no phone required. Built-in Bluetooth also lets you run everything from the VictronConnect app, and an AUX input adds monitoring of a second battery, midpoint voltage or temperature.
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4.4/5
We fitted this BMV-712 Smart to the auxiliary battery bank of a converted van, after years of relying on a plain voltmeter that told us little. The shunt bolts onto the negative terminal, and the round display sits on the dashboard thanks to the supplied 32.8 ft (10 m) RJ12 cable, plenty long enough that no extension was needed. Once the battery had been calibrated through a first full cycle, the percentage and amp-hour readout matched reality closely, and a glance at the dial was enough to know whether there was enough left for the night. Bluetooth takes over the moment more detail is wanted: discharge history, alarm thresholds, all configurable from VictronConnect within minutes. We also wired the AUX input to the starter battery, handy for keeping an eye on both from one unit. Two small gripes: the shunt terminals take very heavy cable (M10), proper lugs are needed, and the display, while readable, is modest next to a phone screen. For a permanent physical readout on the dashboard, this monitor remains the reference.
Victron Energy SmartShunt 500A/50mV IP65
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The Victron SmartShunt 500A/50mV IP65 tracks battery status continuously and sends it all over Bluetooth to the VictronConnect app, no physical display needed.
- Shunt: 500A/50mV
- Bluetooth: Built-in, VictronConnect app
- Rating: IP65
- Accuracy: 99.6%
- Built-in Bluetooth and IP65 housing, no display or cable to fit
The Victron SmartShunt 500A/50mV IP65 is an all-in-one battery monitor with no display, sending its readings (voltage, current, state of charge, remaining runtime) over Bluetooth to the VictronConnect app on a smartphone or tablet. With a claimed accuracy of 99.6%, an IP65-rated housing resistant to moisture, and a VE.Direct port for connecting to a GX device, it's compatible with lithium, AGM and flooded lead-acid batteries. VE.Smart Networking also lets it wirelessly pair with other Victron equipment.
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4.3/5
We fitted this SmartShunt to a lithium leisure battery, drawn to the idea of not needing any physical display at all: everything runs through Bluetooth and the VictronConnect app. Pairing is instant (the PIN code is printed right on the housing), and the app shows state of charge, estimated time remaining, discharge history and plenty more within seconds, with real depth of detail. The IP65 housing is reassuring in a damp battery compartment or on a boat. Over time, readings stayed consistent against a reference multimeter, and the Bluetooth link never once proved flaky, even from a room away. The only real downsides: you absolutely need a phone nearby to check anything, there's no backup screen, and early firmware updates stalled part-way through for some users. For anyone happy to run everything from the app, the SmartShunt remains a benchmark that's hard to beat in this category.
Votronic LCD Battery Computer 100 S
$220.00
How much charge is really left in the leisure battery? The Votronic LCD Battery Computer 100 S measures voltage, current and charge continuously, up to 100A.
- Measuring shunt: 100A (up to 200A peak)
- Supported voltage: 12V and 24V
- Compatibility: Lead-acid, Gel, AGM, LiFePO4 lithium
- Battery capacity: 50 to 2000 Ah (adjustable)
- Precision 100A shunt, LCD screen, optional Bluetooth
The Votronic LCD Battery Computer 100 S is an onboard battery monitor paired with a precision 100A shunt. It shows in real time the voltage, charge/discharge current and state of charge (Ah and %) of the leisure battery in a van, RV or boat, in both 12V and 24V. Compatible with lead-acid, Gel, AGM and LiFePO4 lithium batteries, it has a backlit LCD screen readable even in bright sunlight, and can take an optional Bluetooth module for monitoring via the Votronic Energy Monitor app.
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4.0/5
Fitted in a converted van with a 200 Ah LiFePO4 leisure battery, the Votronic LCD Battery Computer 100 S quickly replaced our rough voltmeter guesswork. The shunt wires onto the battery's negative terminal, the display sits on the technical panel, and after a first full charge to calibrate the unit, the percentage and amp-hour readout genuinely matches reality. Handy day to day: a quick glance tells you whether there is enough left to get through the night without needing to recharge. The backlit screen stays readable in bright sun and in the dark, and dialling in the right battery profile (LiFePO4 in our case) takes only a few minutes. The one regret: Bluetooth is not built in, you need the optional module to get the app and charge history, which adds to the bill. The measurement resolution is also a notch below a high-end Victron SmartShunt. For reliable monitoring and genuine control over your battery's runtime, this Votronic monitor clearly does the job.
Votronic LCD Battery Computer 200 S
$243.15
How much charge is really left in a large RV house battery? The Votronic 200 S measures voltage, current and charge, up to 200A.
- Measuring shunt: 200A (up to 400A peak)
- Supported voltage: 12V and 24V
- Compatibility: Lead-acid, Gel, AGM, LiFePO4 lithium
- Weight: 10.4 oz (295 g)
- Precision 200A shunt, LCD screen, optional Bluetooth
The Votronic LCD Battery Computer 200 S is an onboard battery monitor paired with a precision 200A shunt, built for the large battery banks found in RVs and vans. It shows in real time the voltage, charge/discharge current and state of charge (Ah and %) of the house battery, in both 12V and 24V. Compatible with lead-acid, Gel, AGM and LiFePO4 lithium batteries, it has a backlit LCD screen readable even in bright sunlight, with an optional Bluetooth module.
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4.0/5
Fitted in a Class A motorhome with a 400 Ah LiFePO4 house battery bank and a sizeable inverter, the Votronic LCD Battery Computer 200 S immediately proved its worth over the 100A model, which struggled the moment the inverter drew hard. The supplied Smart Shunt, more accurate and less power-hungry than the older generation, fits exactly like the 100 S, on the battery's negative terminal. After a first full charge to calibrate the unit, the percentage and amp-hour readout genuinely matches reality, even under heavy short-term current draw. The screen stays readable in bright sun, and dialling in the LiFePO4 profile takes only a few minutes. The one downside, as with the 100 S: Bluetooth is not built in, you need the optional module to get the app and charge history. For an RV or van with a large lithium battery bank, this Votronic monitor finally gives the measuring headroom the 100A model lacked.
VII - Related questions
Your battery recharges as you drive, thanks to the alternator. If that is not enough (short trips, winter, an idle vehicle), the simplest way is to connect it to the mains with a charger-maintainer, which recharges it and then keeps its charge at the right level. You will find a selection in our Car & motorcycle battery chargers section.
It is not always easy to know the state of health of your vehicle battery. Battery testers let you find out in seconds whether your battery needs replacing, along with its charge level and other useful information. You will find a selection on this page.
Every driver knows the method of connecting alligator clips to another vehicle's battery. Effective, but painful when you are alone in the middle of nowhere. The jump starter (or battery booster), a kind of very powerful lithium battery, gives your battery the boost it needs to start your engine, with no outside help.
