I see this question pop up again lately. Devices often have their own built-in safety when the processor or another part runs too hot at which point they slow down or turn off. It isn’t at all good that a device heats up to that point and no guarantee of safety. In case of hot batteries, I’d be worried. The thing is, it’s not up to the software developer to fix this, you can’t. It’s a hardware flaw that will differ per device that you can do nothing about. You can simply not guarantee a device will not run hot. Even if you had general access to one or more temperature sensors of just any device that would run your software, it would be pointless to say “the sensor says it’s 90C on the CPU, let’s slow down to a crawl”. It’s up to the device to handle that and differs per used hardware components.
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