The Ryobi RC18120 ONE+ Compact Fast Charger charges at a rate of 2.0Amp/h, meaning you can charge a 2.0Ah battery in 1 hour. It is compatible with all ONE+ 18V Lithium-ion batteries. Indicator lights show the status as batteries are charged and maintained. Intelligent condition monitoring, evaluates the battery's voltage and temperature while charging, ensuring long-term durability. Ready-to-go indicator shows when the battery has reached 80% capacity.