I took a screenshot whenever my iPhone gives the 20% battery warning, then plugged it in.
On iOS 6, my 4S got 6:37 of usage time (mean of 17 points)
On iOS 6, my 5 got 8:57 of usage time (mean of 15 points)
On iOS 7, my 5 got 6:47 of usage time (mean of 7 points)
So...2 hours sacrificed for iOS 7. Worth it, in my opinion, but a big price to pay for sure. The mean and median were very close in all cases. I had background app refresh and location history off in iOS 7. I hope iOS 8 doesn't have a similar effect.
On iOS 6, my 4S got 6:37 of usage time (mean of 17 points)
On iOS 6, my 5 got 8:57 of usage time (mean of 15 points)
On iOS 7, my 5 got 6:47 of usage time (mean of 7 points)
So...2 hours sacrificed for iOS 7. Worth it, in my opinion, but a big price to pay for sure. The mean and median were very close in all cases. I had background app refresh and location history off in iOS 7. I hope iOS 8 doesn't have a similar effect.
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