Ryobi Battery RB18L40 18V One+
(8 reviews)
Compatible with every tool in the Ryobi One+ range, this genuine RB18L40 battery offers a 4Ah capacity at 18V for constant, reliable power.
Buy at AmazonAs an Amazon Associate I earn from qualifying purchases.
Characteristics
- Capacity: 4 Ah / 72Wh
- Voltage: 18V (Lithium+)
- Compatibility: Ryobi One+ tool range
- Constant power, fast charging, genuine Ryobi
Detailed overview: Ryobi Battery RB18L40 18V One+
The RB18L40 is a genuine Ryobi battery, compatible with the entire One+ range of cordless tools: drills, drivers, saws, grinders, sanders and many more. Thanks to Lithium+ technology, it delivers constant power throughout the discharge, fast charging and an excellent lifespan. With a 4Ah capacity (72Wh) at 18V, it suits both occasional DIY and more intensive use. An on-board 4-LED fuel gauge lets you check the remaining charge at a glance, so you are never caught out in the middle of a job.
This battery is not just for tools: paired with the Ryobi 18V One+ 150W inverter, it becomes a self-contained 230 V socket holding 72 watt-hours, enough to run a laptop or a lamp far from any mains supply.
Frequently asked questions: Ryobi Battery RB18L40 18V One+
Yes, and that is the range's central selling point: Ryobi has not changed the One+ 18V mount since its launch, so a recent pack also powers a much older tool. Just check that your tool carries the One+ logo and not another of the brand's platforms.
Not necessarily. A pack left flat for several months drops below the threshold the protection electronics will accept, and the charger then refuses to start. That is sometimes recoverable with a brand charger, often not. To avoid it, store your packs at around half charge and top them up every six months: that is what makes the biggest difference to their lifespan.
Need help choosing?
Other products in the "Portable electrical" category
Bosch 18V 5Ah compatible battery
$51.75 (44)
Replacement battery for Bosch Professional 18V cordless tools (GBA, BAT618, BAT620, GSR, GSB, GBH). Restore your device's original runtime when the battery gets tired.
Bosch CORE18V 8.0 Ah Battery
See price (18)
Bosch's highest-capacity CORE18V pack: CoolPack 2.0 cooling and 21700 cells for 50% more runtime than the 4 Ah battery, across the full 18V lineup.
DeWalt XR 18V 5Ah (DCB184)
See price (21)
The genuine runtime for your DeWalt tools: the XR 18V 5Ah battery (DCB184) powers the whole XR cordless range with a charge indicator and full compatibility.
Dyson V8 Battery
$38.20 (26)
Give your vacuum its breath back: this 21.6V replacement battery restores the runtime and suction power of your tired Dyson V8.
Published on 02/09/2026