The Bosch CORE18V Performance Battery is the next-gen Lithium-ion battery that delivers 2X the power and runtime of standard two-layer 4.0 Ah 18V batteries with minimal increase in volume and weight. Features advancements in design that reduce resistance and increase efficiency, to improve the performance-to-weight ratio of tools used on the jobsite all day. Engineered with 21700 cell technology, the battery delivers power and performance for high-capacity tools. Bosch engineered the exclusive CoolPack 2.0 technology to manage the heat of the higher power cells, and extends the life of the battery by 35%, lowering the cost of battery replacement.