You could try a kickstart of the battery to restart the software of the battery.
If phone is very hot…don’t blame the battery and even battery-firmware-reset most likely will not help.
If you don’t have a hardware fault you have to search for an app/setting which consumes massive CPU.
@paulakreuzer: I would suggest to move all real “battery problems” to a different (new?) thread…that’s kind of a different challenge… —> THANKS!
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Is it really the battery that is hot or is it, like with my phone the right upper corner above the battery?
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Above the battery…
Then I would suggest a kickstart of the battery.
I can’t follow this line of arguments…
“Hot phone --> located above battery (=CPU/chipset etc.) --> kickstart battery” ??
My view is exactly contrary:
if your CPU is hot (and not the battery), than a battery calibration wont solve this.
- You have to check for an app causing this or check for hardware failure, as I stated already above.
- You already checked behaviour after reboot and while in Flightmode?
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Though, I am not convinced that a reset of the battery firmware would resolve the issue; as the electronics get hot, my assumption would rather be that some process is running in the background.
edit: therob was faster 
Yes, my phone is hot above the battery. I just wanted to know if that was also the case with @evidemment. But this of course has nothing to do with the battery.
My comment to try a kickstart was meant for the battery problems @evidemment stated earlier in this thread.
Actually, I was wondering if the procedure described to kickstart the battery is such a good idea.
I read once (can’t recall now the source) that deep discharging of Li-ion batteries may cause their death, and following the here described procedure (discharging to 0%) would be a deep discharge, right?
I found that article after my notebook battery (Li-ion) died - apparently because I deep discharged it.
Because the title of the thread implies that the battery gets hot, I am wonder if it really is the battery?
OK thanks for all your input…
There’s something really wrong with my phone as it also reboots several times a day…
Support is sending me a new phone so I hope all will be good… I would really like to understand what happened though… In order to know if there’s a way to prevent future problems.
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I think you are right in general. But I also think it is a difference if you drain the battery controled for some seconds/minutes to 0% and directly start to charge, or if you let your battery die for some weeks by self-discharge…but it’s just a guess.
I think we can conclude, that for all reported problems here, “only” the phone is hot, not the battery itself.
If it is located under the written text “yours to open, Yours to keep” of the FP2 back, it is for sure “only” the CPU unit.
Then you should look in the software for a bad app, which keeps the CPU busy, whats results in hot CPU and fast draining of the battery, thus short lifetime (as expected under “full load”!).
@evidemment
Gave you a try to disassmble and reassembe all easy parts to teardown and check? Maybe just a loosen contact somewhere?
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I changed the title again.
I have no problems with my phone rebooting. I have had the screen freezed once, but that was the first day and never since.
I think my screen is making the battery drain. How long can you other people use your phone with teh screen lit? With an hour of surfing on the lowest brightness, it is down 30 percents. Maybe it is normal?
I would like to share my battery’s experience (to be precise, I have activated battery saver during the night).
I experience some problems about the % calculated at low battery for 2 days now. Has someone experienced this kind of problem?
I’ve noticed that Wi-Fi has consumed 10% of the battery but Wi-Fi wasn’t activated at all during this cycle, so I don’t undestand this matter…
Does anyone who have more information Arion about batteries have any idea if this is a sign of a system fault that is draining the battery? Or if some of us have got broken batteries?
What do the community think?
Ps
About the WiFi consuming battery when it is not on, I have figured out that you have to go into the settings of “advanced for wifi” (search for it in the settings) and you have to turn it off there too.
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After this nights charging, the battery drains faster than ever. And I am no longer able to see proper stats from the battery… Broken battery? What do you think from my attached images?
(also notice the “-18” mark in the upper left corner. Sweden is really on the north pole)
Whats after reboot and some waiting time?
Things are getting worse… Phone is very hot… and it’s the second time today I charge it because it was close to 2%… 
I really can’t figure out that is causing this…
And now it rebooted… I’m going back to my FP1 while waiting for remplacement…
A replacement phone gets priority at the distributing centre for shipping off. Although Fairphone can’t speed up the actual time the courier needs to get to your door.
I hope so that you have better experiences with your replacement phone.
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