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 "High Performance Drill/Driver 2611 - M18 " High Performance Hammer Drill/Driver 2620 - M18 SAWZALL Reciprocating Saw 2630 - M18 6 " Circular Saw 2650 - M-18 " Hex Impact Driver 49-24-0171 - M18 Work Light 0880-20 - Cordless Vac