2 X Bosch 18v 5Ah Li-ion Coolpack Batteries Lithium Ion Cordless
Efficient Bosch cooling technology in and around the battery prevents heat damage, gives up to 65 percent longer run-time and up to 100 percent longer lifetime. 5.0Ah Cool Pack cells have finer ''windings'' than 3.0Ah allowing more power density in the same pack size with less electrical resistance, making it more efficient.