Fast charging and discharging produce lots of heat. For my own benefit I created an Automate flow that checks battery temperature periodically when the screen is on and limits CPU speed to the minimum usable until it comes down to less then 40 Celsius, which is supposed to be a battery-saving value. If needed I can disable the restriction manually from notifications. I must proudly say that It’s a quite “cool” customization of my Fairphone… 
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