Iphone 5 shuts down when battery life still shows 10% left

Install iOS7 on iphone 5 and the device will power down sometimes when it still shows 10-20% battery life then not power back on, while displaying that it should be plugged in. Also the phone will sometimes jump from 20% life down to something like 1-3% on the indicator  in mere seconds and powers off shortly thereafter.
Basically the phone gets down to what shows as 20% battery life and may shut down at any point after that....

This could be because the battery has not been properly calaberated try the link below. http://www.apple.com/nz/batteries/iphone.html

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