Testing sbh52 battery life on music playing today.. Fully charged at 8am this morning.. Has been playing music for more than 2hours now. Seems like the battery down around a quarter now.. So i think roughly it can play music non-stop for at least around 6hours.i will try to keep the music play until it fully drained if can.. But at this rate, I think the battery is comparable or better than my ipod nano.