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The Energy Policy and Conservation Act, as amended, prescribes test procedures and energy conservation standards for various consumer products, including uninterruptible power supplies (UPSs), which the Department of Energy (DOE) is treating as a class of battery charger. In the final rule, DOE is amending the test procedure for UPSs to incorporate by reference relevant portions of the latest version of the industry testing standard, harmonize the current DOE definitions for UPS, total harmonic distortion, and certain types of UPSs with the definitions in the latest version of the industry standard, and add a no-load testing condition, as an optional test. DOE has determined that the amendments adopted in the final rule will not alter the measured efficiency of UPSs or require retesting or recertification solely as a result of DOE’s adoption of the amendments to the test procedure. Additionally, DOE has determined that the amendments will not increase the cost of testing.