The dewalt flex volt xr slide li ion batteries stand at the forefront of cordless technology they are the worlds first convertible 1854 volt batteries offering unprecedented levels of power provides the unique ability to power heavy duty construction power tools whilst still being compatible with existing dewalt xr 18 volt products and offering increased run time it offers users increased run time over any of the 18 volt xr 40ah or 50ah li ion batteries dcb546 battery capacity 60ah18 volt 20a