🇬🇧 🇩🇪 Generic battery to replace FP1 battery (⚠️see first post for warning)

The S beam battery looks ok-ish, but it’s also too short. Mind that the batteries could have a much lower capacity, depending on how much time ago they were produced.

I just clicked through the batteries on this page and found the samsung galaxy s3 mini one by chance. I think I got to that page by searching “smartphone batteries dimensions” in duckduckgo.

There are apps that can display the battery temperature. If it shows about 25°C on a freshly booted phone it should work and it should go up to about 38°C when you use 3G for a while (that’s my experience with the original FP1 battery).

When you let the phone lie in the direct sun, it should eventually give you a warning tone and shut down because of overheating.


thanks for sharing, HermannMeuth! I just ordered two of those vhbw batteries and I will try your solution.

Besides, I wonder if the temperature sensor thing is really a problem. There’s a temperature sensor inside the battery and yes, it provides the phone with the information about the temperature. But it would be a high risk to rely on the phone to shut off the battery (a software bug could prevent that from working) in case of overheating. So my guess (just a guess) is that the battery protection circuit takes care of that and just reports the temperature to the phone for additional safety an/or diagnostic measures.

Does anybody have reliable information on this topic?

Since @werner_noebauer links to a supposedly equivalent but sold out Changhong battery for P6T, V9 and others here, … how about this:



“971 suppliers can give you a quotation.” … Perhaps Fairphone could buy a few and check out whether they are any good.

Edit: Found another site with some more pictures of this battery:



yeah, brilliant. @Douwe, has this been tried?

@werner_noebauer, @HermannMeuth et al, how did you establish equivalence?

I guess there is no such thing as equivalence unless the battery is specifically produced for a phone model (we do need standardized smartphone batteries!)

Most important things, from my point of view:

  • correct output voltage (3,7/3,8V)
  • temperature monitoring works
  • dimensions of the battery

The capacity is not so important, but a higher capacity is of course preferred. (The Samsung batteries I mentioned above only have 1500mAh, and the current FP1 battery has 2100mAh.)


I will receive one of those batteries tomorrow or on Wednesday and will report back. “Testing for thermal safety” will be done using the app DevCheck. At the moment it displays 27°C for my original FP1 battery, but it goes up to 39°C, when I use 3G and surf the internet for about half an hour. I will compare these values to the ones obtained with the generic HB5N1H battery.


The FP1 was based on a existing phone design for reduce costs. So unless the was a redesign to the battery, there ought to be other phones out there that take the identical battery.


Yup, this is mentioned four posts up in this topic. As far as I know, nobody has ever verified that those actually work (or that there were modifications for the FP1), and they don’t seem to be available any more either.

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Thank you for doing the good work not just for yourself, but for many others. :slight_smile:


I have just tried out the batterie of Samsung Mini S3 in my FP1. It does not work, because the 3 Pins do not match exactly the 3 contacts of batterie! …And YES, the samsung batterie fits well into the FP1 back - fixed with two small matches and slightly pressed towards the contact pins. But the 3 larger pins of the FP1-case do not fit to the 3 closer contacts on the samsung batterie - no electrical contact!
BY THE WAY: For FP3 the Faiphone developers should simply just copy the measures and specifications of a common and suitable Huawei or Samsung batterie!! Because they are available much longer, as the chinese Fairphone producer could deliver it!


Sorry, I didn’t get that the order confirmation was not a sending confirmation… I haven’t received a confirmation that the battery has been sent off, but the first email said that even after the sending confirmation, it would take about three working days until the battery arrives. I’ll be back home in the middle of next week. Let’s see if it has arrived by then… :laughing:


Surprisingly and unexpectedly the battery already arrived today! :smiley: I placed it towards the left side and fixed it with a curled up cable tie. No grinding was necessary, but I removed a tiny little sticker inside the battery compartment (see below).

Below are some size comparison images and and the temperature measurements (they don’t work).

(This is the sticker I removed.)

No matter how hot the CPU and SOC are, the battery temperature doesn’t change. I therefore conclude that the temperature monitoring does not work.

The battery does its job well however, and it didn’t fail me in a 40 minutes phone talk that I just had. I will also try the charging at night and will report any weird behaviour.


Thanks for all the good ideas!

I tried a original Huawei HB5N1H battery and can confirm that it worked. The original battery at least has a NTC103 type as thermistor between the middle terminal and the minus-terminal.

It went through the whole load-cycle without problems, temperature reading varied up to 36°C.

At room temperature the readings were slightly different, but NTCs are notoriously inaccurate.

Rumours have it that cheap 3rd-party batteries might have a constant 10kOhms resistor instead, which might lead to the battery catching fire, explode, you name it.

In case you want to use any replacement battery I would recommend to check that a NTC103 is installed. This can easily be done with a Ohm-Meter. The resistance between the middle terminal should be around 10kOhm at room temperature and the drop quickly if you warm-up the battery mildly (warm with your hand, place it in the sun or on some warm, not hot, surface).

I hope it doesn’t have to be mentioned here that using a lighter or other open flames are not a good idea.

If the resistance doesn’t significantly drop, don’t use it!

Hope this helps!


Habe mich hier durch gelesen und bedanke mich bei den kreativen Köpfen - ja schade dass man jetzt auf solche Akkus zurück greifen muss und damit die Philosophie des FP1 versaut aber da ich auch ohne aktuelle Software gut mit meinem FP1 klar komme und nur den Zeitpunkt des Akku Kaufs verpasst habe - werde ich diese Lösung ausprobieren
Hoffe es geht gut
LG sabs


Hi @Stefan & @Karsten_Benz,
thanks for testing this alternative solution and feedback :slight_smile:

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Interestingly the temperature reading goes down to 23°C when the phone heats up:

What do you make of that?

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Then it’s definitely not a NTC thermistor.

It might be a ‘constant’ resistor (carbon, metal) which have a slight positive temperature coefficient, which mean it will be read as a temperature drop by the phone.

Since the coefficient is quite small relative to the NTC, even a very hot battery could show as a lower temperature. But I didn’t do any math around this.

However: I would not use it, unless the phone is in a steel sink with nothing combustible around it :slight_smile:


I use since today an original Huawei HB5N1H battery. Here is my test result. The battery works well. When charging, it was slightly warmer (40 °) but then cooled to 36 °. During the loading process I copied many data over the network and by the way phoned. No problem!


Does this battery fit very well in terms of thickness? Above it was stated that it is 5,6mm, which is 1,1 mm more than the original one. This may be a major disadvantage if the battery sooner or later tends to expand a bit…

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See for yourself. The batteries are very similar in thickness.

Original FP1 battery on the right side.