• Compact 4.0 Ah battery – delivers 2X the runtime compared to previous generation BAT612 2.0 Ah battery • Compact power – lightweight, compact solution • High-power Li-ion cells – feature a single layer of enhanced 21700 cells for greater battery efficiency • Bosch-exclusive CoolPack 2.0 technology – cools the battery 15% faster and provides 135% longer lifetime compared to non-CoolPack Bosch 18V Lithium-ion batteries • Cutting-edge battery design – includes copper end plates, power rails and a flexible circuit board for reduced resistance and increased efficiency • Weighs only 1.10 Lbs. – 4.0 Ah Compact battery provides performance comparable to much heavier batteries • System compatibility – compatible with a full range of Bosch 18V Li-ion cordless tools; not optimized for use with PROFACTOR tools • Charge-status Indicator – features a high-resolution charge-status indicato