The Bosch PRO Genuine 18v Cordless CoolPack Lithium-ion battery and charger set consists of two 18v 4ah batteries and a quick charger. This set has an extremely fast charging speed for all 18v batteries, charging a standard 18v 4ah battery to 80% in only 48 minutes. All of the Bosch Professional batteries are compatible with new and existing Bosch Professional tools in the same voltage class. Features & Benefits • 18v 4ah battery with extended runtime for all 18v class tools • Fast charging speed for all 18v batteries • Compatible with all new and existing Bosch Professional tools in same voltage class • Charge indicator level Specifications • Battery Voltage: 18v • Battery Type: Bosch Professional Lithium-ion • Battery Charging Voltage: 14.4 – 18v • Charge Current: 4A • Charge time at bat. cap. 4ah (80%/100%) approx.: 48/65 mins