Lightweight and compact battery in robust battery housing for durability. Coolpack technology delivers high performance, impressive run time and longer lifetime. Features Bosch Electronic Cell Protection (ECP) to protect the battery against overload, overheating and deep discharge. Bosch Hyper Charge offers rapid charging to 75% after just half the charge time. Easy-to-read fuel gauge indicator displays battery status. Battery can be charged at any time with no damage to cells, regardless of the charging state. Designed to fit all Bosch 18V Lithium-ion power tools.