Overheating Laptop While Charging!
How are the fans operating on battery vs. on AC power? Do you notice the fans increasing in speed on AC power?
What are the idle clock speeds on battery vs. AC power? Even though its idling, once you plug in AC power, the laptop may enable a higher processor minimum.
You can kind of check this through Windows via the Power & Sleep settings. Go to Power & Sleep settings via the search bar. Then on the right side, click on Additional Power Settings. Then "Change advanced power settings". And look for "Processor power management".
Mine looks like this;
So, minimum on battery, the processor will run at 5%, but when it's plugged in, it'll run at minimum at 99%(or whatever you set it too).
I would check this on yours and see if you can change this manually OR you may need to choose a different Power Plan in Windows.
In my "Power Saver" plan, the minimums are both 5%;
Yours may be set to 100% when plugged in for minimum processor state. This could be causing your laptop to idle at a higher clock speed, which will start warming up the laptop until it reaches a point where it'll throttle itself down due to the heat(60c-70c like you indicated).
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