The Milwaukee M12 range of tools can be powered by any of the compact
1.5 Ah, 2.0 Ah, 3.0 Ah or 4.0 Ah 12-volt, Red Lithium-Ion battery packs.
The small M12 1.5 Ah and 2.0 Ah battery packs offer superior power in a
much more compact package than traditional NiCd / NiMH 1.5/2.0 Ah 12 V
batteries. The larger M12 3.0 Ah and 4.0 Ah battery packs offer
increased performance and extended run time.