Thanks for the comments.. I just had my ZX300 for 10 days now. So far never managed to get above 10 hours.. Today I'm trying to play back without much screen on (eg, spectrum analyzer, etc), fiddling with menu, setting change, etc - just leave it on, use physical side buttons for volume & skip/pause/rewind... BTW I'm not using Direct Source.. I'm using 4.4mm balanced port connected to wired mdr-1am2 headphones with some EQ setting, volume level ranging between 72-84, DSEE-HX on, vinyl processor set to "turntable resonance", DC phase linearizer on.. I'm just playing mp3 files, no FLAC or DSD.. Let see how far the battery can last...