DeWalt s XR Flexvolt system has introduced a range of 54v power tools which offer exceptional performance and runtime, enabling the mobile user to reliably undertake heavy duty applications without need for mains power. As well as providing the high voltages necessary for these new tools, Flexvolt batteries are also backwards compatible with the DeWalt XR 18v Lithium Ion system, letting you share a single battery platform between a huge variety of cordless tools. This Flexvolt battery operates at 6ah when connected to an 18v machine or 2ah in 54v mode. Features and Benefits Compatible with existing DeWalt XR 18v lithium ion power tools as well as 54v Flexvolt machines. Automatically switches voltage according to connected power tool. Onboard fuel gauge for checking power/charge status.Specifications Battery Capacity: 6.0ah/2.0ah Battery Voltage: 18v/ 54v Battery Chemistry: Lithium Ion.