Off-topic but I've been curious: how well do phones handle saunas? I thought the heat and moisture would pretty much be the worst environment for electronics. Is that not the case?
I have a barrel sauna with a Harvia. I take my phone in all the time. One level only. Where my head is, is where the thermostat is. When the temp says 170F the phone which is maybe a half meter below my head will almost never overheat. At 190F it will overheat eventually. Usually around 15 minutes or so. The higher I hold the phone and the less I insulate it the faster it overheats. “Overheat” in this case simply is the iPhone warning that it is getting too hot. I have the most recent iPhone SE at the time of this writing (2022 iPhone SE)
There’s no danger to the phone whatsoever. The phone is very good about protecting itself. Outside of the heat warnings it cools down and functions normally afterwards. The only real problem is the annoyance of not being able to use the phone in the sauna because Apple is a little overprotective of the device.
I would personally not call regularly exposing lithium ion cells to 170+ degrees F “safe”.
Why do you think those protections are there?