Delivers maximum runtime, maximum power and more recharges than standard lithium-ion batteries. The M12™ 4.0Ah REDLITHIUM®-ION Battery Pack features superior pack construction, electronics and performance to deliver more work per charge and more work over pack life than any battery on the market. With Milwaukee durability built into each pack, this battery runs cooler and performs in climates below 0°F/-18°C.Managed by Milwaukee’s exclusive REDLINK™ Intelligence, the battery features overload protection to prevent you from damaging your cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. The temperature management system and individual cell monitoring help maximise battery life.