FP2 Battery Problems (drains quickly, CPU gets hot) - See batteryguide for workarounds

I removed and reassembled the screen twice… nothing changed… this is what I get

Phone was charged all night…

I’m desperate again… this will not do…

It’s not about a SIM being bad but a SIM having services that FP2 doesn’t support or handle properly. Nevertheless, that’s just something that seems to be affecting some people, and I didn’t mean to imply it would explain all problems.


as far as I know the “battery duration” is an estimated value based on the previous durations.
So I hope that the real battery duration is better than the shown one at the battery settings.

Yeah I know that… but today it’s just as bad… :frowning:

The only way of saving battery I found is not use the phone at all and switch it off!!! which defeats the purpose… :wink:

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OK this is incredible… look at this and check the time… the only thing I did was take the screenshot… :frowning::sob::rage:


It’s a pity that your battery duration did not improve after removing the screen :frowning:

In my opinion there are basically two main reasons for a low battery duration:

  1. hardware issue (battery itself, screen, cpu, WiFi, etc. consume too much energy)
  2. software issue (OS itself, apps that cause a lot of activity)
    Sometimes it is very difficult to separate hardware and software issues and to find out the real cause.

Did you read this article:

from the Fairphone support team?

Another approach:
I did not try them by myself but maybe one of the mentioned apps can detect an app which is the reason for your problems (in that case it would be a software issue):

(:warning: Please be aware that you use this apps at your own risk!)

If you think it is more a hardware issue, it is probably necessary to replace or repair parts of your phone (e.g. new battery).
Did you contact the Fairphone Support team and have you already opened a ticket?

Maybe for a longterm observation this app is useful:

It records the charging state of the battery for a longer duration than the default battery stats (default is 1 week, but it can be set to 1 month or always).

I installed this app today and will post my experiences with it.

Of course I did…

And I’ll probably contact support but I wish to find a solution before that… as it’s my second FP2 (first one already replaced)

May I ask what was the problem with your first FP2?

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Yep… random reboots, mishbehaving apks and getting really hot and battery problems… :wink:

Things got better with this one and the upgrade… but the battery problem is back…

Should I put the battery in the phone and then start charging or should I start charging for a while and then put the battery in phone? Another person explained which steps to do and said I was to kickstart it by charging the phone without battery and then inserting the battery to give it a kick, but now i’m not sure which one is the correct way. Please tell me!

Hi Jeppe,

here are the exact instructions @borjan from the Fairphone Support team sent to me:

Additionally you can find infos about battery, charger etc. here:

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As before I’m very close to throwing my phone against the wall… :persevere:… It’s 9:20 and phone battery is 54%. It’s hot again… Removing screen gave no results… I am desperate…

I also hesitate to send my phone for repair because I need it…


I have recently received my FP 2 for work, and I am testing at the moment its battery usage. Unfortunately, I have also measured a battery drain of around 50% in 2 hours when surfing with Firefox via WiFi and a rather dark screen. (In fact, BetterBatteryStats has measured a drain of around 23.5 % per hour.) It should be noted that the battery drain was not that high on the FP1 (maybe around 10-15 % per hour when the battery was new.)
A very short test (and therefore not meaningful) with another browser (Opera) has shown a better battery usage of 17% per hour on the FP2. This would be in line with @Elipsus 's comment about Firefox.

I am still checking whether this battery drain is normal or whether there is a problem with my FP2.
Hence, can some readers maybe share their experience when it comes to the battery life when surfing?

  • Is such a high battery drain normal if using Firefox?
  • What battery life (or battery drain per hour) would you describe as normal when surfing with the FP2?

It should however be noted that I am using FPOS OS (with Xposed installed), which could impact my battery life experience. (However, Xposed is not known for really increasing the energy consumption.)

Perhaps is the browser Lightning from F-Droid an option?

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I see you are using a weather app. Which app is that? I think that is the cause of your problems. I have had similar issues. Let me know which app that is.

I once had massive battery drains, but on other phones, with a defective sd card.
You should take it out temporarily.

If the situation is unchanged, I would be interessted in the active apps in your FP2.
Especially in the active icons on your status bar.
1-battery warning / 2-Mail, which one? / 3-screen shot / 4-drop box / 5-? / 6-?
Could you post a screenshot of “settings>battery>battery consumption diagramm (the view when you click on it)” and “settings>apps>active apps”?

Do you move between areas with changing reception for one or both of your SIM cards?
Have you observed roaming between two carriers for one of your SIM cards?

My card SD is new… I changed it after comments on this forum.

I have posted multiple battery consumption diagramm… but I’ll do it again as soon as I have my phone a bit charged. Because right now it’s charging after not having lasted a day without even being used for anything…

I did the screen off again… no change… So I’ll get back to you…

Weather Underground that comes with HD Widgets…