Just used my iPhone for 45 minutes music in gym, still 100%
Gotta love having no buggy push connections draining your battery![]()
4S is rated at 40hrs music play back on apple spec sheet which mean it should lose in theory 3.125% listening to 45minutes of music.
Wow. from my calculation you suffered 0% loss in 45min. Which plotting on my graph shows you will have infinite or lifelong battery life! Off the charts! That or, the % gauge isn't too accurate.