DeWalt DCB547X2 XR FLEXVOLT Convertible 18v/54v Lithium-Ion 9.0Ah Battery Twin Pack 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 its not even going to get in your way. FEATURES World\'s first convertible power tool battery pack Compatible with all 18v XR and 54v XR FLEXVOLT tools* A 54v Battery that has unprecedented levels of power On a new XR FLEXVOLT powertool the battery voltage steps up to deliver GAME CHANGING LEVELS OF PERFORMANCE It can switch itself to 18v so is compatible with existing 18v system Run x2 simultaneously for 108v super powered FLEXVOLT cordless kits On a traditional XR powertool the XR FLEXVOLT battery operates at 18v and delivers extended runtime Includes transport cap for safe transportation of batteries meaning it isn\'t a class 9 dangerous product SPECIFICATION Voltage: 18v / 54v Battery Capacity: 18v 9.0Ah / 54v 3.0Ah Cell Components: 15 x 20mm Cells Wh Without Transport Cap = 162 Wh Battery for Power Tool Wh With Transport Cap = 3 x 54 Wh Battery for Transport Length: 138 mm Width: 87 mm Height: 97 mm Weight: 1.1 Kg *This battery is not compatible with DCR017 & DWST1-75663 TOUGHSYSTEM radios