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The Rockwell RK2812K2 High performance Drill Driver utilizes the LithiumTech battery system which is designed to hold a higher energy capacity, which means longer over all run times. In fact, the High Performance LithiumTech Drill will run twice as long as a drill with a regular Ni-Cd battery. LithiumTech batteries have the best power-to-weight ratio as well, which means lighter and more compact power tools. LithiumTech batteries will endure three times the number of charge cycles as an ordinary Ni-Cd battery, so they last longer. And like all Rockwell Cordless tools, the LithiumTech batteries are covered by the Free for Life replacement guarantee.