IPhone 4s battery drain: one of the reasons

Hi All!
I found one of the reason of battery drainage. I'm sure by 100% and that's why:
Since the day 1 I have very good battery life: about 0.3-0.5% battery off during standby, charge needed 1 per 2 days etc. Nothing to complain. It was during 2 months already. Most of things on.
I use the iPhone with 2 simcards and change it about twice a month. Today morning I did the next exchange. I put in the same card I mostly use. I was in a car and plug the iPhone to charger. I found that the phone became unusual warm during charge and most strange that it became warm near the sim-slot.
I charged it for 100% and unplug. And I was wondered - the battery drained to 1% within 6 hours! It was a 15 hours drive so I had time. I charge the iPhone for 25% and was noticed then that discharge was about 1% every 3-4 minutes. AND! The sim slot still little bit warm.
At home I take the SIM away and went to sleep with 55% of charge. After 6 hours of dreams I got 52% - about 0.5% per hour as usual.
I put the SIM back but clean it (by ditry t-shirt honestly). And now the discharge is normal again and nothing warm.

2 days battery back up with iphone 4S ??? looks like you don't even use your phone. but keep it for show off. well better sell it and buy a basic phone just to keep it with you and make 1 call per day.

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