DeWALT 18/54V 9.0Ah XR FlexVolt Battery

DeWALT XR FlexVolt: the world’s first 18/54V convertible battery pack system. A 54V battery that has unprecedented levels of power, finally giving you the power you need from a cordless tool. That's not all though - it can switch itself to 18V so it is compatible with your existing 18v XR power tools, offering extended runtime meaning you don't need to replace your existing kit - not even your 18V XR charger, as these batteries are compatible! The FlexVolt range includes a host of top-performing powerful, brushless and cordless tools powered by either a single 54V FlexVolt battery, or twin batteries to give the power of a 108V tool. This battery has the same width and length of a 18V XR battery, with only a small increase in height - so it's not even going to get in your way.