SlimPack 18V Lithium-Ion Battery Bosch Cool Pack batteries have a unique design that incorporates advanced heat-conductive housing that significantly reduces heat buildup while you work, resulting in a more efficient battery pack that stays cooler while giving you up to 2x the battery life and 65%. Featuring a state-of-the-art Bosch exclusive Electronic Cell Protection (ECP) system, each battery guarantees optimal tool performance even in tough work conditions. Compatible with all Bosch 18V Lithium-Ion tools and chargers Unique Cool Pack design uses a special heat conductive housing and ribbing to pull heat away from inside the battery to keep the battery cooler Cool Pack design manages battery cell temperature reducing heat-up to provide up to 2x the life of standard batteries Integrated digital fuel gauge LED indicator provides users clear state of battery charge Durable housing survives drops up to 3m SlimPack 18V Lithium-Ion Battery - BAT612 BAT612