DEWALT 20V MAX Battery, Premium 4.0Ah (DCB204) Plastic / Metal Imported *Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18 Premium XR Lithium Ion pack provides up to 33 percent more capacity than standard 20V MAX battery packs 3-LED fuel gauge system allows immediate feedback on state of charge No memory and virtually no self-discharge for maximum productivity and less downtime Weighs 1.42 lbs allowing user maximum run-time in a lightweight battery Compatible with the entire Line of DEWALT 20V MAX Tools