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 damage to 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.