The Milwaukee M18 and M12 Multi-Voltage Charger accepts all M18 and M12 batteries, so you'll always be prepared and productive on the jobsite. This versatile unit charges batteries sequentially, reducing your time to manage charge cycles. The charger communicates directly with the battery pack to monitor cell voltage, temperature, and charge status to ensure a full charge. The charger powers up Milwaukee compact batteries in 30-minutes and extended capacity batteries in 60 minutes. The M18 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 3.0 Ah of runtime. With built-in Milwaukee durability, this battery runs cooler and performs in climates below 0F/-18C. 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.