The Bosch GXS18V-15N15 CORE18V compact starter kit delivers next-gen battery performance and a charger. The CORE18V compact battery is the next-gen Lithium-Ion battery to keep the power and runtime, while losing the weight. Engineered with 21700 cell technology, the GBA18V40 single-layer battery matches the power from the original two-layer 4 Ah battery with improved performance per cell. The Bosch GAL18V-40 charger can completely charge a discharged CORE18V 4 Ah battery to 80% in 48 min 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 finished charging. The battery provides exclusive coolpack 2 technology to manage the heat of the higher power-density cells and it provides better cooling than the previous 4 Ah double-layer versions.