The instruction manual for the charger specifically states that you should "Charge only Ryobi lithium-ion rechargeable ...

Like many other cordless tool brands, Ryobi battery charge ... but consult the manual or official website if you're unsure), ...

However, if it doesn’t last as long as its estimated rate, it could be a faulty battery, a problem with the charger, or the device not storing the energy correctly. The standard Ryobi ONE+ ...

from the standard versions to the high-performance models (the Rapid Charger or any of the RYOBI 18V ONE+ chargers, however, can't charge NiCad batteries). Besides the ONE+ battery slot ...

To power the unit, Ryobi supplies a 40V Lithium-ion battery and its corresponding charger. Another useful accessory provided is the mulching plug, enabling a swift transition to the mulching mode when ...