Or, why don't you plug the unit into the wall and let the batteries fully charge before listening it it?? Or seeing as the batteries for the unit are optional, don't buy the batteries and run it off the mains power all the time. Then you won't have to worry about any potential loss from power getting diverted from the power supply to play your music.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5