iPhone gets very hot when charging. Apple can't help.
So my iPhone 5S gets very hot when charging, when I get up at 6:00 my iPhone is dead by lunch with minimal usage. I thought maybe it was some app or E-Mail task causing it to overheat so I restored and just configured it via Welcome Screen, no accounts no apps. Still after 7 hours of standby it only has 7% charge, 6 minute usage. So I made an appointment at the Apple Store and they ran diagnostic and said the battery is fine but I could still get it swapped for 75 euro, but he doeesnt recommend since battery is fine. So I said okay thanks for your time since there is nothing they really can do I guess. I don't have Apple Care and the iPhone become 1 year old in Nov.
Is there any other tips you may have? Otherwise before it causes a fire I will just send it to apple recycling.
thanks
iPhone 5s, iOS 8.1.2, null