Cordless Tool Kits

A battery that gets too hot, whether from baking in the sun or simply from heavy use, is a short-lived battery. Charging also generates heat, which is why the state-of-the-art "smart" chargers in these kits have temperature-sensing circuitry and fans to cool things down, as well as computer chips programmed to precisely meter the recharge rate.

Bosch's two-bay charger will bring both new 18-volt and older 9.6-volt battery packs back from the dead in just half an hour.