GENERAL DESCRIPTION This is the world's first convertible power tool battery pack. It is compatible with all 18v XR and 54v XR Flexvolt tools, providing unprecedented levels of power. The battery automatically switches to 18v for compatibility with existing 18v systems. When used with a new XR Flexvolt power tool, it delivers superior performance. You can run two batteries simultaneously for a total of 108v in super-powered Flexvolt cordless kits. On traditional XR power tools, the XR Flexvolt battery operates at 18v, offering extended runtime. TECHNICAL SPECIFICATIONS Voltage: 18v / 54v Battery Capacity: 9.0Ah XR Flexvolt