The DeWalt XR Flexvolt is a convertible 18/54V battery: completely backwards compatible with existing 18V DEWALT products yet with the option to amplify its voltage to an unprecedented 54V to be used on bigger construction power tools giving this battery the versatility to be used by professionals and DIY enthusiast. Traditionally, when compared with corded power tools, even the most efficient cordless system provided a compromise between increased portability and reduced power, between greater ease-of-use and reduced runtime.