Bosch 1600A002U5 18V 5.0Ah Li Cool Pack Battery 18BLUE50

The high-endurance 18 volt XL battery with 5.0 Ah and CoolPack technology.
A further 25% increase in runtime (cf. with 4.0 Ah battery).
CoolPack technology for up to 100% longer lifetime (cf. battery without CoolPack).
Extremely robust: fully functional even after a 3-m drop onto concrete.
Bosch flexible power system – battery suitable for all tools in one voltage class.