XR FLEXVOLT is the only battery on the market that automatically switches from 54V to 18V enabling it to power both 18V and 54V power tools in the XR product range.
Compatible with all 18V XR and 54V XR FLEXVOLT tools
Compatible with all 18V XR chargers

Battery Voltage : 54 / 18 Volt
Battery Capacity : 5.0Ah (54 Volt) / 15.0Ah (18 Volt)
Battery Type : Lithium Ion