The powerful 36 volt XL battery with 6.0 Ah and COOLPACK technologyMin. 50% longer run-time (compared to 36 V 4.0 Ah battery)COOLPACK technology for up to 100% longer lifetime (cf. battery without COOLPACK)Bosch flexible power system ? battery suitable for all tools in one voltage classWhy this tool?Extremely robust ? fully functional even after a 3 m drop onto concreteFEATURES:Voltage 36 VoltNo self-discharge, no memory effect and a higher energy density thanks to Li-Ion battery technologyOptimal protection of the cells against excessive heat due to special, heat conductive housingBattery 100% compatible with all tools within its voltage class. Choose the XL battery for longest runtime or the compact battery for best handling