Our M18T & M12T Multi-Voltage Charger accepts all of our M18T and M12T batteries, so you'll always be prepared and productive, especially on jobs that require a mix of M12T and M18T Milwaukee cordless power tools. The battery charger communicates directly with your battery pack to monitor cell voltage, temperature and charge status to ensure a full charge. As an added level of communication, the charger indicates when the lithium-ion battery reaches an 80% charge, providing you with confidence that your battery can complete a substantial amount of work without waiting for a full charge. (1) M18T REDLITHIUM HIGH OUTPUTT XC8.0 Battery (48-11-1880). (1) M18T & M12T Rapid Charger (48-59-1808).