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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. Features: Compact 18V battery provides next-gen power and run time while losing the weight; useful for tools used on the jobsite all day Charging convenience allows users to charge a Bosch 18V 4.0 Ah battery to 80% in 48 minutes or to 100% in about an hour High-power cells use enhanced 21700 cell technology, combined with advanced design, to produce higher power for a longer time Cutting-edge cell design engineered to improve performance in tools used on the jobsite all day Bosch-exclusive CoolPack 2.0 technology cools the battery 15% faster than previous versions Lightest high-power battery weighs only 1.15 lb, but provides performance comparable to much heavier batteries Battery-status indicator provides indication if charger is in standard-charging mode, long-life mode or when charging is complete Specifications: Battery Voltage: 18V Included Battery Amp Hours: 4.0 Ah Battery Chemistry: Lithium-ion Charger Input Voltage: 120V Charge Time to 100%: 1 hour Charger Warranty: 1 year limited Battery Warranty: 1 year limited; 2 years with ProVantage What's Included: (1) GBA18V40 18V CORE18V Lithium-Ion 4.0 Ah Compact Battery (1) GAL18V-40 18V Charger