DEWALT DCB547 18v / 54v XR FLEXVOLT 9.0ah Battery XJ Twin Pack, 18 V, Yellow, Pack of 2

Please note this is 2 x DCB547.Features:World's first convertible power tool battery packCompatible with all 18v XR and 54v XR Flexvolt toolsA 54v Battery that has unprecedented levels of powerOn a new XR Flexvolt powertool the battery voltage steps up to deliver superior performanceIt can switch itself to 18v so is compatible with existing 18v systemRun x2 simultaneously for 108v super powered Flexvolt cordless kitsOn a traditional XR powertool the XR Flexvolt battery operates at 18v and delivers extended runtimeSpecifications:Voltage: 18v / 54vBattery Capacity: 9.0Ah XR Flexvolt