Uses, or should use? On an Android device (S5) I've found the battery usage from music playing not-insignificant - perhaps it prevents the phone from fully ente

Uses, or should use? On an Android device (S5) I've found the battery usage from music playing not-insignificant - perhaps it prevents the phone from fully entering standby, or something? At a very rough estimate, I'd say it uses 20% as much power to play music as active usage requires, though this is very much anecdata. Either way, I'll second the recommendation to get an external battery pack - a high-quality one will give more audio playback time than a media player, with much more utility and convenience.