My phone is Samsung J7108. It dies when it reaches 90 percent and it will turn on once again. But then, when it reaches 80, it will die again. I have to plug it on charge so that it will die down.

I also noticed that once it's fully charged, as the battery decreases, my phone will heat up as well then it will be so hot and will die. Another thing that also happened, whenever I turn on my mobile data, it will die too.

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    Your phone is quite old (uses Android 5), may be you got infected by malware that misuses the phone for bitcoin mining or ad video loading in background and therefore the CPU runs all the time at 100%. Save your data to a PC and/or the cloud and perform a factory reset. – Robert Mar 5 at 10:38

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