The Dewalt DCB548 is an XR FLEXVOLT series 18v/54v convertible battery pack. The DCB548 has an incredible 12Ah/4Ah capacity. Ideal for high demand/high powered applications with the Dewalt XR FLEXVOLT power tools. 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! This battery has the same size and weight as DCB547 9Ah XR FLEXVOLT battery.