Ref power when used as an iPod, I usually take the dog out to warm up, then do an hour in the gym, then do a 20 min jog down the promenade as a warm down and the phone rarely drops off 100% through all that. It is every bit as good as my 8gb ipod on power and significantly better if used in airplane mode, to the point that the iPod was relegated to the drawer and never used again.