The M12 & M18 super charger charges batteries up to 4x faster than base Milwaukee chargers, massively reducing downtime and maximizing productivity. The charger accepts all M12 and M18 batteries, providing an upgrade for both systems. M18 HIGH OUTPUT? batteries with premium charge components are particularly optimized for the super charger, with the M18 REDLITHIUM HIGH OUTPUT? HD12.0 charging in only 1 hour. Featuring redlink intelligence, it communicates directly with the battery to monitor cell voltage, temperature and charge status to optimize the performance and extend the life of the pack. As an added level of intelligence, the super charger identifies the best charge rate for each battery inserted, meaning each pack will charge in the shortest amount of time possible.