I'm shocked at how fast my new 5S seems to lose power. I thought battery life increased by 10%. Around 9pm last night it was at 40%. I checked at 2am and it was at 15%...by 6am it was at 6%. And all it did during those four hours was to sit untouched on my nightstand. This was on the original store charge. I will run it down to zero and give it a new charge today and hope it improves with some use.