The Bosch 36V CoolPack heat-conductive housing is specifically designed to cool internal cell temperatures for longer life. The Bosch 6 Ah Lithium-Ion battery delivers  more runtime versus a 2.6 Ah battery without CoolPack technology. Bosch batteries are compatible with electronc monitoring systems (EMS) on Bosch power tools that regulates voltage for heavy-duty applications. The Bosch36V battery is built with advanced technology high-capacity, low-resistance Lithium-Ion cells. Features a fuel gauge to ensure that users always know their power level.
Bosch 36V allow significantly more runtime over previous generation of Bosch 36 V batteries

Bosch 36 V batteries keep the same footprint as previous generation 2.6Ah 36 V batteries

Maximizes battery runtime on the jobsite and eliminates user frustration in looking for charged battery

Longer battery runtime increases productivity for critical system tools like rotary hammers, drill/drivers and saws