IPhone 5 fully charged symbol when on only 7%?

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My iPhone five is showing the symbol as if it were fully charged, but it's only at 7% as you can see in the image
Where did I go wrong?
It's supposed to show the Z thingy

Oh u made a mistake to buy iphone 5 cuz actually all iphones battery is so poor. You should'd been bought samsung galaxy s3 or s4

If you run out your battery out completely so I won't turn on any more (either by an app or just waiting a couple hours) then charge it up completely for about 8hrs then it should make the battery reset to normal. It will also indicate the right amount of battery.

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