The 3.0 amp-hour capacity of the 4-Volt Lithium-Ion Battery provides superior runtime and long life. The 4-Volt battery offers longer performance than NiCd batteries for less interruption on the jobsite and no memory effect. Milwaukee’s unique lithiuim-ion technology helps ensure that optimal battery life and runtime are achieved, while protecting the battery and cordless power tools during the toughest jobsite applications. This slide-style battery offers consistent fade-free power until the end of discharge.