Chosen Solution
I have this iphone 7 and it heats up even not in use. As it in stand by mode. It charge normally. It also shuts down or restarts sometimes randomly even before battery is zero. It heats up during use and while not in use. Secondly, battery drains fastly when not in use followed by heating as mentioned above.
The problem may be because of a faulty/heavily degraded battery. You may need a replacement battery.
This sounds like a short on one of the main power rails. You will need to check the PP_BATT_VCC and the PP_VDD_MAIN line with a multimeter. Is this the same phone that has the cell problems?
Hi M. Zain Ul Abidin, As @pod_boi has already suggested, the chances are good you simply need a new battery. On the iPhone 7 this is a reasonably straight-forward repair, one that you can probably do yourself with the help of the iFixit battery replacement guide. My suggestion would be to buy the iFixit battery with the Fix Kit that includes everything you need to do the job right, including display and battery adhesives, along with the necessary tools. 20% OFF iPhone 7 Battery: New Part and Replacement Kit And the good part is that iPhone batteries are on sale for 20% off right now! Here’s the guide that will step you through the whole procedure and get your phone working again. iPhone 7 Battery Replacement - iFixit Repair Guide Best of luck with your repair; let us know how it goes!
