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One day i charged my iphone till 90%to92% then in didn't use my phone and went to sleep after 10 hours I checked my phone and the battery is showing only 20% charge is left. In the meantime i didn't used my phone so is there a battery issue or some thing else???

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Apple has a battery replacement program for iPhone 5. You can check eligibility on this Apple page

Apple has determined that a very small percentage of iPhone 5 devices may suddenly experience shorter battery life or need to be charged more frequently. The affected iPhone 5 devices were sold between September 2012 and January 2013 and fall within a limited serial number range. (...)

The program covers affected iPhone 5 batteries for two years after the first retail sale of the unit or until March 1, 2015, whichever provides longer coverage.

  • Definitely, the iPhone 5 is notorious for that. – RedEagle2000 Aug 27 '15 at 20:41
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First, check to see what application is consuming battery power. To check this, open Settings>General>Usage. Under Battery, touch 'Battery Usage'. After some loading time, you will see a list of Applications that have used Battery power in the last 24 hrs and last 7 days. If there is an application using a significant percentage of power that you have not used, you may wish to kill that app or restart your iPhone.

Specifically to the iPhone 5, see @Tetsujin response on extended warranty from Apple.

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