The Milwaukee Rapid Charger recharges all M18 , M14 and M12 REDLITHIUM-ION battery packs. It recharges in sequence - first in, first to charge - resulting in less time needed to manage charging cycles. M12 REDLITHIUM-ION 2.0Ah / 4.0Ah battery packs recharge in 28 min / 57 min or less. M18 REDLITHIUM-ION 2.0Ah / 4.0Ah / 5.0Ah battery packs recharge in 26 min / 47 min / 59 min or less.
Specification Voltage: 12/14.4/18 Volt.