Ios 6.1.2 iphone 4s turning off

I havent updated to 6.1.3 yet, and maybe this will fix my problem, but when my battery gets to about 20% and I turn on any app it turns its self off. and as soon as I plug it in it shows I have 21+% battery... why does it do this? I have about 14GB available on a 64GB iphone 4s. My phone is just over a year old and hasnt have this problem since updating to 6.1.2. I thought it was just the apps ive been running, but just opening up settings at about 20% shuts the phone down.
Now my iPod with 6.1.2 doesnt have this problem nor does my iPad 2. But my 2 iPhone 4s' do.

Try This...
Close All Open Apps... Perform a Reset... Try again...
Reset ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy...
Connect to iTunes on the computer you usually Sync with and “ Restore “...
http://support.apple.com/kb/HT1414

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Hello dantecruso,
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Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
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Ios 6.1.2 iphone 4s turning off

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