Fairphone 5 hot while charging

My Fp5 heats up while charging. It sometimes heats up while using it, normal usage. Sometimes while heavy use, not warm. So, there is no real pattern here…
At home, wifi, not in the sun, cahringing, and not using it, it gets warm.

Does the charger matter? I use a plug from samsung and a cable from my Mac. But I had another one before, the cable and plug from my Mac. Is tt strong? Did I f* up?

I can’t find AoD in my settings. Anyone?

Top battery usage:
Mobile network 5G 17% 5hrs20min (changed to 4G to compare)
Screen 14% 9hrs28min

Battery health 100
charge/discharge cycle: 15

Battery protect is activated.

I got the phone like 3,5 weeks ago.

Have a good one guys!

ps. just disconnected from the changer since it reached 80% and the battery protect kicks in. It has started to cool down. ds.

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Are you charging fast or slowly? That may make a difference. Then for the test I’d disable 5G and limit it to 4G as this has shown to be a battery burner in some networks already.

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Hello, what temperatures are you reaching? You could perhaps install accubattery app to check during the charging the volume, current, and temperature.
This is mine, eco charge, for reference

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Changed immediately to eco charge! Great ide, thank you!
4G - check!
Thank you!

Hi! Good idea ! Currently updating phone so can’t take a print, but, my fp-app showed 35 degrees temp. Assuming it’s Celsius, forgot to check. That seems high, no?

I believe my phone reached that as well, but not with charging, just heavy usage. And no heat warning.

For reference, I decided to change the charger for a weaker one for my e-book reader when it showed 45 Celsius and growing.

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OK, smart. Will see what other chargers I can find here at home.
Is it possible to activate heat warning somehow?
Will head out now, currently warm and sunny in Sweden so have to take advantage :smiley:
Have a good day!

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To be honest, I have not been able to find a clear guidance on that. From what I understood, the phone should give the warning, turn off, or limit some operations on its own, yet I am not sure it actually happens. It did not happen with my e-book reader but that is a different company brand.

The general advice will be not to keep the phone in the sun and check the temperature in the app.

Edit. I would also be careful using laptop chargers as they might be too strong, but have no proper knowledge here.

Perhaps someone will be able to guide us more.

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No worries, especially with eco charging enabled that doesn’t make any difference at all. The charger will stick to 5V and then the phone takes 1A with screen off or somewhat more (around 1.5A) with screen on, no matter what the charger is capable of doing. When they are used with a notebook they will switch to higher voltages and the notebook will take more current. I sometimes take my Dell power brick if I don’t have my normal charger at hand and that works just as described.


@Meaghan Thanks guys! What would be a too high temp? Just normal usage atm, not charging, and temp is 34C… normal or slightly too warm?
My phone is new and I’m considering giving it back, hopefully for a new one. MondayEx?
Went up to 37 yesterday…

@Kivrella The only guidance I found was about higher than 43, but I guess it would be nice to get official backup from support. So you may just contact them directly

@Martin_Anderseck could you please have a look here? These are the shots from charging my onyx e-book reader, on a brand cable but with my mobile devoted Baseus charger.

When charged as the only device the current is higher but the temperature rises above 40, when charged simultanoeusly with a mobile (the second shot), the current goes down and the temperature is OKayish.
Is a charger or a e-reader to blame? I found an old charger laying in the drawer and as it is weaker, I can charge my e-reader within acceptable temperatures but I was wondering what is happening here.

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It’s the fault of the device to be charged. The charging electronics is in the device, it should limit the current to something that is healthy for it. But looking at these numbers (3 amps is quite something) I’d indeed take a charger that delivers less to extend the lifetime of the device to be charged. On the other hand: If the battery was huge this could be acceptable. And one more thing: If the vendor says the operation of his device is only safe when using a specific charger then this might be okay as well. USB specifications probably don’t include 5V/3A, either, but I haven’t looked it up.
My statement however was about our phones and here I can say that with my FP5 it really doesn’t make a difference.