Milwaukee's M18 & M12 Rapid Charger charges battery packs up to 40% faster, reducing your downtime and maximizing your productivity. The battery charger accepts all MILWAUKEE M18 and M12 batteries, providing a charging upgrade for both systems. The charger features REDLINK Intelligence and communicates directly with your batteries to monitor cell voltage, temperature, and charge status to optimize the performance and extend the life of the pack. As an added level of communication, the charger indicates when the battery reaches an 80% charge, providing you with the confidence that a substantial amount of work can be completed without having to wait for a full charge.