This Bosch ProCORE18V Battery & Charger Starter Kit contains:2 x 18V ProCORE18V 12.0Ah Li-ion Batteries.Bosch ProCORE18V Li-ion Batteries feature a new generation of cell technology which delivers the same performance as standard batteries in an optimised size and weight. The battery also features COOLPACK 2.0 technology for superior heat dissipation from the inside to the outside of the battery. As heat can damage the cells, this COOLPACK 2.0 technology provides an impressive 135% longer lifetime than standard batteries, enabling it to perform for longer work periods.1 x 18V GAL 18V-60 Professional Charger with Active Air Cooling technology. This cools batteries down and keeps them cool whilst charging. It has 3 charging modes: Standard, PowerBoost, and Long Life. PowerBoost mode is your choice for a full charge at the highest charging speed. Select Long Life mode if you want a gentler charge up to 80% and longer battery lifetime.