This Bosch GBA Li-ion Battery Pack has been designed for comfortable work in Bosch's 36 V category. It is 46% lighter than the 36V 6.0Ah for improved comfort in handling and use. This battery also features COOLPACK 1.0 technology for improved heat dissipation from the inside to the outside of the battery. As heat can damage the cells, the COOLPACK technology provides a longer battery lifetime and enables it to perform for longer work periods. Compatible with all Bosch Professional 36 V tools and chargers.