Battery compatible with all Ryobi 18V ONE+ battery devices. The philosophy of Ryobi ONE+ is that the battery, charger, and devices are purchased separately, meaning you only pay for the components you need. The Ryobi battery and its corresponding fast charger are perfectly matched, allowing for gentle charging of the battery in just 120 minutes. The lithium-ion battery is equipped with individual cell monitoring, ensuring even charging and discharging. The lithium-ion technology protects the battery from self-discharge and allows for short interim charging due to the absence of a memory effect. The four-stage charge level indicator provides information at the push of a button about the current charge status of the battery at any time. With its universal shape and robust holder, the ONE+ battery fits all Ryobi ONE+ devices. The advantage here is that the batteries can be swapped among each other, reducing the number of batteries needed.