IPhone 4S not fully charging after iOS7 update?

I updated my phone to iOS 7 and now my phone is charging but extremely slowly. I have left it on overnight (8 hours) from 3% and it is now only on 80%.

I have tried different cables and resetting my iPhone but nothing seems to work. I've even had it on charge whilst playing with it and the battery has been going down instead of up!

What is wrong with it and what can I do?

Ring up apple and tell them what happened and if you have got warranty on the phone they will. Give you a original charger

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