The M18 Milwaukee Compact Lithium-ion Battery has less weight and a reduced size. This battery offers up to 40% more run-time, 20% more speed, and 20% more torque. Milwaukee Tools are durable and tough. It operates in temperatures down to 0° F, runs 20% cooler, has Digital Power Management, and offers you up to 50% more recharges extending the overall life of the battery. This includes a 3 year warranty from Milwaukee. Battery works on the following M18 Tools:M18 Compact Drill/Driver - M-18 ¼" Hex Impact Driver. When you need tough, think Milwaukee Tools. Purchase a Milwaukee Compact Lith-ion Battery from AEGIS Tools today.