CTA has recently published ANSI/CTA-6008, Portable multimedia equipment - Determination of battery duration - Part 1: Powered loudspeaker equipment IEC 63296-1:2021. This standard represents the US National Adoption of IEC 63296-1:2021, which specifies the methods for measuring the battery duration at defined sound pressure levels for continuous music playback of battery-powered loudspeaker equipment. A primary battery or secondary battery can be used as a power source for the loudspeaker and its composite equipment. In the case of composite equipment, this method for the measurement of battery duration can be applied under the condition of powered loudspeaker playback only. 

For more information and to access the standard, visit Portable multimedia – Battery duration of powered loudspeaker equipment.