The MILWAUKEE? M12? XC High Capacity REDLITHIUM? Battery is designed with superior pack construction, electronics, and performance to optimize work per charge and work over pack life. It offers 4.0 Amp hours of runtime. With built-in Milwaukee durability, 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 users from damaging their cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. The temperature management system and individual cell monitoring help maximize battery life. Use this REDLITHIUM? extended-capacity battery to power all Milwaukee M12? cordless power tools.