Brand: Keeppower
4 products in the catalogue.
Our Keeppower products
Keeppower 18650 3500mAh
$16.33 (8)
One of the highest-capacity 18650 cells on the market: the Keeppower 3500mAh packs a premium cell and a built-in protection circuit for flashlights and demanding devices.
- Capacity: 3500 mAh (min. 3350 mAh)
- Protection: Built-in circuit (PCB)
- Discharge: Up to 8A continuous
- Cycles: Over 500
- High capacity with reliable built-in protection
The Keeppower 18650 3500mAh is a premium rechargeable lithium-ion cell, popular with fans of powerful flashlights and electronics. It uses a quality cell (Panasonic/Sanyo type) offering high real capacity (3350 mAh minimum, 3500 mAh typical) and a built-in protection circuit against overcharge, deep discharge, over-current and short-circuit. With a 3.7V nominal voltage, continuous discharge up to 8A and over 500 cycles, it is a safe bet for anyone wanting reliability and runtime. A niche brand, it is mainly found at specialist retailers.
The Keeppower 18650 3500mAh is a cell you often see recommended on flashlight forums, and for good reasons. Its reputation rests on the quality of the cell used (a Panasonic/Sanyo NCR18650GA type base) combined with a carefully made protection circuit. In practice, the real capacity delivers: independent tests confirm a little over 3350 mAh, placing this cell among the highest-capacity 18650s. The built-in protection is reassuring for daily use: it cuts off on short-circuit, overcharge or over-deep discharge, protecting both the cell and the device. In use, it powers a hungry flashlight through long sessions without flinching. Two things to know: at very high current (close to 7-8A continuous), the protection can trip before the cell is fully drained, and above all, it is a niche brand, hard to find in mainstream retail in France, where you have to go through specialist retailers. But for quality and runtime, it is a reference.
Keeppower 14500 950mAh
$9.18
A 14500 cell (AA-sized) that charges directly via micro-USB, no external charger needed: the Keeppower 950mAh, handy and protected.
- Capacity: 950 mAh (min. 900 mAh)
- Charging: Built-in micro-USB port
- Protection: Built-in circuit (PCB)
- Discharge: Up to 2A continuous
- Direct micro-USB charging, no external charger needed
The Keeppower 14500 950mAh is a rechargeable lithium-ion cell in the 14500 format (AA-battery size), with a unique advantage: a built-in micro-USB charging port that lets you charge it without a dedicated external charger. It also carries a protection circuit against overcharge, deep discharge and short-circuit. With 950 mAh (900 mAh guaranteed minimum), a 3.6V nominal voltage and continuous discharge up to 2A, it is a handy choice for compact flashlights and small AA-format devices.
On a format as small as the 14500, this Keeppower cell's micro-USB function genuinely changes daily use: no more digging out a dedicated charger, a simple USB cable is enough to top it up, handy while travelling or hiking. Tested in a compact flashlight, it holds its rated capacity reliably, with decent runtime for such a small format. The built-in protection circuit brings welcome reassurance on a cell this size, trickier to handle bare: a clean cut-off on short-circuit or over-deep discharge. Discharge current stays modest (up to 2A), which limits its use to less power-hungry devices, not to be confused with an 18650 or 21700 built for high power. Another point worth knowing: this is not a classic AA battery you can swap in like-for-like, its 3.6V voltage is well above a AA's 1.5V, so check your device's compatibility first. For a compact flashlight or a small AA-format gadget, the convenience of USB charging clearly makes the difference.
Keeppower 21700 5000mAh
$22.06
A high-capacity 21700 cell from a brand known for its built-in protection circuits: the Keeppower 5000mAh targets powerful flashlights and DIY packs.
- Capacity: 5000 mAh (min. 4900 mAh)
- Protection: Built-in circuit (PCB)
- Discharge: Up to 10A continuous
- Cycles: Over 500
- High-capacity 21700 format, reliable built-in protection
The Keeppower 21700 5000mAh is a premium rechargeable lithium-ion cell, in the larger 21700 format (bigger and higher-capacity than the 18650). As with all its models, Keeppower selects a quality cell and adds a built-in protection circuit against overcharge, deep discharge, over-current and short-circuit. With 5000 mAh (4900 mAh minimum), 3.6 to 3.7V and continuous discharge up to 10A, over 500 cycles, it is a reliable choice for powerful flashlights, e-bikes and DIY packs.
We already knew Keeppower's reputation on the 18650 format, and the 21700 5000mAh cell does not disappoint. Tested in a high-end flashlight, it comfortably delivers on its rated capacity: the real-world figure matches the guaranteed 4900 mAh minimum, translating into noticeably longer runtime than a classic 18650 at the same settings. The built-in protection circuit remains the brand's strongest asset: it cuts cleanly on short-circuit or over-deep discharge, a real plus over a bare cell. In use on a current-hungry flashlight, it copes well under sustained load, without unusual heat. Two caveats: Keeppower remains a niche brand, hard to find outside specialist cell retailers, and the 21700 format means checking your battery holder's compatibility before buying (longer and wider than an 18650). For anyone after a protected, reliable 21700, it is a safe bet.
Keeppower 26650 5500mAh
$21.15
A high-capacity 26650 cell from a brand known for its built-in protection circuits: the Keeppower 5500mAh targets very powerful flashlights and DIY packs.
- Capacity: 5500 mAh (min. 5400 mAh)
- Protection: Built-in circuit (PCB)
- Discharge: Up to 10A continuous
- Cycles: Over 500
- High-capacity 26650 format, reliable built-in protection
The Keeppower 26650 5500mAh is a premium rechargeable lithium-ion cell, in the 26650 format (larger than the 21700, for even higher capacity). As with all its models, Keeppower selects a quality cell and adds a built-in protection circuit against overcharge, deep discharge, over-current and short-circuit. With 5500 mAh (5400 mAh minimum), 3.6 to 3.7V and continuous discharge up to 10A, over 500 cycles, it is a solid choice for very powerful flashlights and demanding DIY packs.
The 26650 format confirms the reputation Keeppower already built with its 18650 and 21700 cells: a quality cell paired with a carefully engineered protection circuit. Tested in a search-light flashlight (very current-hungry), this cell holds up without flinching, with real capacity close to the guaranteed 5400 mAh minimum. Its larger size compared to the 21700 delivers even longer runtime, at the cost of extra bulk worth planning for (battery holder, flashlight body). The built-in protection remains a genuine everyday asset: a clean cut-off on short-circuit or over-deep discharge, without a second thought. The only caveats: it is a niche brand, less easy to find than a mass-market cell, and the 26650 format is rarer than 18650 or 21700, with a smaller range of compatible devices. For a very powerful flashlight or a DIY pack that needs capacity, it is an excellent base.