Why is my Iphone battery going down while being charged?

Well just last night I charged my Iphone 4 All night and woke up to it being at 28% . It shows that it's charging with the little lightning symbol in the right hand corner but it actually going down. Now it's at 24% and I'm not even using it? Could it just be my charger or my actual phone? If it was the charger I would think it wouldn't show the lightning symbol but it does. What wrong with it.

Just take it to apple store, they can help you to fix it.

The Current Isn't High Enough So Its Going To Charge Down Faster Than It Can Recharge… You Need A New Charger

I'd try to borrow a friend's iPhone 4 and try to charge it with your charger, it it doesn't charge properly is the charger, if it does, then you may have an issue with your battery.

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