Why is my iPhone battery decreasing while it's on the charger?

I have had this iPhone for almost 2 years, and it charges while connected to a computer just not pulled into the wall… Can anybody tell me what's wrong with my phone?

Maybe your wall plug doesn't have enough power coming out of it. I'm no tech whizz but my Galaxy S4 battery goes down when I use a wall plug that outputs below the suggested power. Buy a new plug, they'd only cost you a few quid/bucks.

Well, my iPod Touches batteries only last a year.
Get an iPad Wall to USB adapter and see if that works.
You could get your performance tested at apple

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