Battery capasity after update to ios 8.1.2

iphone 4S 16GB, IOS 8.1.2
battery drains out after 8 hours when i updatet to ios 8.1.2, and that without using the iphone.
when I was on ios 7.1.2 battry last at least 2 days.
does anyone know what i should do, i have followd a lot of steps, exit all running apps, disable wifi, bluetooth, even just flymode. But battery drains out.
downgrade to ios 7.1.2 is not an option since apple not signing the ios longer
John Olav

http://www.scottyloveless.com/blog/2014/the-ultimate-guide-to-solving-ios-batter y-drain
also power cycle your battery let it fully drain to where your phone shuts off then fully charge it without using it.
also you can check what app is draining your battery - settings - general - usage - battery usage.

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Battery capasity after update to ios 8.1.2

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