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Help Temperature too hot?

Last week I posted about my [new] phone abruptly shutting down; I noted that it was charging at the time, and the back was hot.

I'm charging right now and for a few minutes it felt unusually hot again, so I checked its temp:

Screenshot_20190108-141142.png


Is 98.6°F something to be concerned about? I mean, I know it's ideal for humans, but what about phones? :D

Moto Z² Force Edition, Oreo 8.0.0
 
Last week I posted about my [new] phone abruptly shutting down; I noted that it was charging at the time, and the back was hot.

I'm charging right now and for a few minutes it felt unusually hot again, so I checked its temp:

View attachment 138794

Is 98.6°F something to be concerned about? I mean, I know it's ideal for humans, but what about phones? :D

Moto Z² Force Edition, Oreo 8.0.0
Simple, just leave it be for a while :) It should cool down automatically :D
 
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Simple, just leave it be for a while :) It should cool down automatically :D
But, what about those phones whose batteries were starting fires not too long ago? I think that's why I'm a bit concerned. I know those weren't Motorolas, but who's to say it can't happen?
 
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batteryuniversity.com has a lot of current (pun intended) info on battery technology that you might find worth reading through:
https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures
https://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
https://batteryuniversity.com/learn/article/all_about_chargers

Regarding all the media hype on smartphones catching on fire, it is important to keep in mind that something like the Samsung Note 7 incident that became its own meme was due to a manufacturing error, and affected a relatively tiny number of phones.
 
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But, what about those phones whose batteries were starting fires not too long ago? I think that's why I'm a bit concerned. I know those weren't Motorolas, but who's to say it can't happen?
Had the same phone tech for three years, it has never ever blown up, even after charging, though keep a fan on by your phone incase :D
 
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If we accept @svim's article as correct (no reason not to) and the upper threshold for Li-Ion batteries is 40°C, then technically you aren't too hot, but you are very close and depending on the ambient temperature, you certainly could exceed 40°.
You know, I'm starting to wonder if--after all these Motorola years--I might have gotten a lemon.

First the random lockup/reboot thing, now a temperature issue. It was around 70° in my room today when the battery's temp hit 98.6--and it gets way hotter than that [outside] here in SoCal.

I'm tired. I don't know what to think. So I'm going to put the phone down and be like Scarlet O'Hara: think about it tomorrow! :)
 
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Something to always keep in mind is that our phones do heat up a lot, and most people want faster, more capable phones that in turn require better CPUs and GPUs that result in generating more heat. There's no ventilation fans, like in a desktop or even laptop, and typically little to no openings for any heat to escape out of, even less so for waterproofed models. Plus there's very, very little open spaces inside with tolerances between everything being very tight so it's basically just conduction for all that heat to slowly leak away. Add a phone case, most not being made of some kind of metal that will transfer heat better but rather plastic or rubberized synthetic that insulates rather than conducts, and that adds to the problem.

A lot of this pertains more to our phones in actual use though, it is puzzling that your phone is heating up like that when it's idle. Assuming this wasn't always happening and just recently became an issue, if you go into your Settings >> Battery menu is there anything showing that looks odd?
 
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Something to always keep in mind is that our phones do heat up a lot, and most people want faster, more capable phones that in turn require better CPUs and GPUs that result in generating more heat. There's no ventilation fans, like in a desktop or even laptop, and typically little to no openings for any heat to escape out of, even less so for waterproofed models. Plus there's very, very little open spaces inside with tolerances between everything being very tight so it's basically just conduction for all that heat to slowly leak away. Add a phone case, most not being made of some kind of metal that will transfer heat better but rather plastic or rubberized synthetic that insulates rather than conducts, and that adds to the problem.
Very good points. Thank you.

Two important differences between my old [which I'm still using] and new phones: old is in an Otterbox Defender Case--so if it ever got hot, I didn't feel it; new has 'turbo' (quick) charging.
A lot of this pertains more to our phones in actual use though, it is puzzling that your phone is heating up like that when it's idle.
No--it's been in use both times. If you look at my 'phone abruptly shut down' thread, you'll see that I was using its camera for the first time when it happened.
Assuming this wasn't always happening and just recently became an issue, if you go into your Settings >> Battery menu is there anything showing that looks odd?
"Always" and "recently" are the same! It's brand new. :) I've gone through its battery settings and haven't seen anything peculiar.

Thanks a lot for your informative and thoughtful comments. They're appreciated!
 
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