The battery lifei s good. Also when you switch thep hone on, theres the option of Phone and Walkman or just Walkman, so if your battery is low, you can just use as walkman and save life.
I have mine off chars from 7:30am till 11pm, and use the Walkman on it for about 4 hours+ a day, and when i coemk to charge again, its on 1/2 or 2/3 of life left.