With the Milwaukee M12-18 C multi-voltage charger, you can recharge your 12V, 14.4V, and 18V Redlithium Li-ion batteries using a single compact station. This eliminates the clutter of separate chargers and saves socket space on jobsites, in workshops, or in service vans. Thanks to sequential charging, the system charges inserted packs one after another on a first-in, first-charged basis to keep your workflow moving. Delivering a 3A charging current, it recharges a 2.0 Ah battery in 40 minutes and a 4.0 Ah battery in 80 minutes. Built-in electronic temperature monitoring actively regulates heat and voltage to protect cell health and maximize overall battery life.