An 18 Volt 2.4 AH Battery for use with all MILWAUKEE 18 Volt Power Plus Driver Drills, Hammer Drills and Circular Saws. More powerful than the 2.0 AH battery for longer run times between charges. Not to be used with 6516-20, 6516-21, 6516-22, 6516-23, 1108-20, 1108-21, 3108-21, 5364-20 and 5364-21.