Bosch 1607A350M0 18V 4.0Ah Coolpack Battery

Efficient Bosch cooling technology in and around the battery prevents heat damage and gives up to 65% longer run-time and up to 100% longer lifetime compared to other battery packs.
4.0Ah CoolPack cells have finer 'windings' than 3.0Ah allowing more power density ('fuel (Ah)) in the same pack size and less electrical resistance (so more fuel efficient).
Less frequent battery charges.
4.0Ah batteries are fully charged in just 45 minutes when using the AL1860CV charger.
Electronic coding for tools and chargers.
High power contacts with silver coating.
Capacity indicator with 3 LEDs.
Red CoolPack housing made of heat conductive material.
In-built temperature sensor.
Large and ergonomic release button.
Robust slide-in interface.
Robust housing.
High quality Li-Ion cells with highest capacity.