The Bosch Core 18V Compact Starter Kit delivers next-gen battery performance and a charger. The Core18V Compact Battery is the next-gen lithium-ion battery that keeps the power and run time while losing the weight. Engineered with 21700 cell technology, the GBA18V40 single-layer battery matches the power from the original two-layer 4.0 Ah battery with improved performance per cell. The Bosch GAL18V-40 charger can completely charge a discharged Core18V 4.0 Ah battery to 80% in 48 minutes and to a full charge in about an hour. This dual-stage charger charges the first 80% in standard charging mode and the remaining 20% in long-life mode, getting users back to work quickly. It features charging indicator lights, showing when the battery is in standard mode, long-life mode or is finished charging. The battery provides exclusive CoolPack 2.0 technology to manage the heat of the higher power density cells, and it provides better cooling than the previous 4.0 Ah double-layer versions.