Scotty Loveless, a former Apple Genius, has posted the best guide we’ve seen to solving iOS battery drain. Unlike many guides that tell you to turn off every feature, Loveless offers a more targeted approach, including instructions on how to test battery drain and specific suggestions that are likely to improve battery life. Two surprises: the Facebook app is a huge battery hog and quitting apps may hurt battery life. follow link
Enable Apple TV Subtitles
While a video is playing, hold down the Select (center) button on your Apple TV remote to bring up the Options menu, then choose the Subtitles view. If there are embedded or external subtitles associated with the video they will appear in the list. If you are using Silver Screen to AirPlay video to the Apple TV, it will dynamically extract the subtitles and send them to the Apple TV.
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The Ultimate Guide to iPhone Battery Drain
I could see that my wife's iPhone 4S was never sleeping (Usage and Standby times were equal). GREAT! I finally had a diagnosis of the problem.
How come this advice is not better known?
But, Apple offers no insight nor tools to help fix this.
Force quit every app - nope. Restarts - nope. Upgrade to iOS 7 - nope. More Restarts - nope. Turn off Location Services - nope. Turn off Background App Refresh - nope. More force quits - nope. Install Battery Performance Monitor apps - nope.
So now what?
Installing System Activity Monitor app helped, but the savings finally came from deleting an old Mail account which obviously was caught in a loop.
Surely Apple could give tools to identify issues like this earlier?