Lithium-Ion provides increased run time with 40% less weight than an 18V NiCad battery. Milwaukee Digital Power Management. Battery fuel gauge, displays remaining run time. 5 year 2,000 charge warranty Milwaukee's Digital Power Management helps to ensure that optimal battery life and run-time is achieved, while protecting the battery and tool during the toughest jobsite applications. Battery works on the following M18 Tools: 2601, M18 Compact Drill/Driver 2610, M18 ½"High Performance Drill/Driver 2611, M18 ½" High Performance Hammer Drill/Driver 2620, M18 SAWZALL Reciprocating Saw 2630, M18 6 ½" Circular Saw 2650, M-18 ¼" Hex Impact Driver 49-24-0171, M18 Work Light 0880-20, Cordless Vac