Bosch Lithium-Ion Compact Battery 18 V (4.0 Ah).
• Compact 18V Li-ion battery – engineered to provide next-gen power and runtime, while losing the weight, for optimized performance
• High-power cells – use enhanced 21700 cell technology, combined with advanced battery design for greater efficiency
• Cutting-edge cell design – engineered to improve performance in tools used on jobsite all day, plus CoolPack 2.0 heat management
• Bosch-exclusive CoolPack 2.0 technology – cooling the battery 15% faster than previous 4.0 Ah double-layer versions
• Lightest high-power battery – weighs only 1.15 Lb., but provides performance comparable to much heavier batteries