The Bosch® CORE18V® 4 Ah Advanced Power Battery delivers high power in a compact size for standard to medium-duty applications, such as drilling into concrete, metal and wood; metal grinding; cutting and even light-duty chipping. The GBA18V40 is designed with high-power lithium-ion cells and includes copper end plates, power rails and a flexible circuit board for reduced resistance and increased efficiency. 

This battery keeps its cool with CoolPack™ 2.0 technology, which cools the battery faster and helps provide longer lifetime compared to Bosch 18V batteries without CoolPack™ 2.0. This compact battery weighs only 1.10 Lbs. but provides performance comparable to much heavier batteries in a lightweight solution. It is compatible with Bosch 18V tools and chargers and the AMPShare™ System. It also has a high-resolution charge-status indicator.