This document specifies the method for measuring the battery duration at a defined sound pressure level for continuous music playback of battery-operated wearable powered loudspeaker equipment. A primary battery or secondary battery can be used as a power source for such a shoulder-carried or body-worn loudspeaker and its composite device. In addition, only equipment that can be placed on or hung from a HATS is covered. Bone conduction speakers are excluded. Portable loudspeaker equipment supporting also video playback as main function is not covered by this publication. Note 1: For composite equipment with audio playback only, the measurement method for battery duration of powered loudspeakers applies (IEC 63296-1).