Bosch have now added the 6.0ah Coolpack battery to their 18v range of blue power tools. Fully compatible with existing power tools and chargers that charge the 5.0,4.0, 3.0ah Cool Pack batteries and chargers. Features A further 20% increase in runtime (compared to 5.0 Ah battery) at the same size CoolPack technology for up to 100% longer lifetime (cf. battery without CoolPack) Bosch flexible power system battery suitable for all tools in one voltage class Extremely robust: fully functional even after a 3-m drop onto concrete Battery with practical charge level indicator This pack includes 2 batteries.