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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 4.0 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 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.