The dewalt xr flex volt 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 runtime it offers users increased runtime over any of the 18 volt xr 40ah or 50ah li ion batteries battery capacity 60ah battery chemistry li