Speaking specifically to the M12 and M18 lines, if you don't want to wait around forever for your near-depleted batteries to charge up on a standard charger, Milwaukee has come up with some solutions.

Unlike Milwaukee's M12 or M18 cordless tools ... more convenient option than ones relying on AA or AAA batteries, as USB ...

Amazon dropped the price on this Milwaukee M18 FUEL hackzall in a rare deal that'll save you $67 off. Shop this super low ...