Option to limit charging to maximum 80%


Yeah, i’d like such a feature as well. I was rooted before, but gave up with the upgrade (i’m running LOS, though), but in general, this would be a nice feature. And i can’t follow the reasoning, as the modern Samsung my wife is using has this feature (check box 'battery health*or something like that, reportedly, there are more manufactures building that in. Probably for escaping possible regulations regarding sustainability). It’s also in the iodé OS, so i thought about porting it to LOS, but this goes over my head… I bought a hardware device (chargie.org), but that’s a kinda expensive solution…


Do they not know about the existence of toggles? :smile:

Please note that this is a community forum. There is only a very little chance that a FP employee (with the authority to change this behavior) will notice this post.


Moved your post here, its actually a repeated discussion. Smart charging is implemented e.g. in Iode OS. How or if possible in a Google certified OS, I dont know…


Well, Samsung does it. It is certified, even if Samsung does a lot of strange/bad things. At least that’s a good solution, as typically there’s no replaceable battery (except for much money…)

Smart charging is implemented e.g. in Iode OS.

This is really interesting ! Since I am a newby I ask: Is it possible to install iode.tech on a fairphone?
I would do it for the charging feature alone, but also for the Google-protection.

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Yes it def is possible to install on the FP4

Edit: best is to ensure the security patch level is same or higher as for FPOS installed, just to avoid bricking…

However I think Iode has implemented other steps to prevent bricking


Well in the case of Fairphone, the answer is quite simple.
Fairphone seems to only aim at being fair with the workers. Doing environmentally friendly choices is frankly something they have no interest in. This is evident by the fact that the bootloader bricking bug is still around after over a year.

The code for this feature is already supplied open sourced by other projects. I somehow doubt implementing it would be very difficult for a competent team of developers.

I doubt that charging exactly to 80% has such an impact on the lifetime of a battery outside a laboratory, that you can call a company not environmentally friendly, it it doesn’t offer such an option.


The battery is constantly taking damage when it’s charged over 80%. Sitting at 100% for almost 8 hours in a row when the user sleeps just isn’t good for the battery.

Here’s a study on car batteries:

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We are not talking about electric cars.
And I know the theory and the laboratory tests. But in real life, I’m most of the times charging to 100% and can still use my batteries for many years. So why bothering with these settings?
And doing it doesn’t make a company or a person ‘environmentally unfriendly’ while doing it makes it the opposite. The world isn’t that black and white.


As Incanus has said it’s not that simple, lab test, car batteries, are way off line for phone use.

The problem with a battery is the rate of charge which causes heat, the expected wear is through the number of cycles is standard to all batteries.

So rapid charging creates heat as does trying to drain a battery below it’s optimum level, which in this case is 3.85V

Charging slowly to 90% or more shouldn’t be an issue much less so that charging rapidly at 60%, but it depends upon the temp.

If the phone is in a warm place or being used, or in anyway is warm then rapid charging can only increase the heat significantly.

So from my own stress tests I can see the difference between the force required to charge i.e. the voltage and the state of charge.

However this is not a lab test and I am only using the date supplied form the phone, but surely that must be the best as that is what a user relies on when charging.

From the graph below you can see the stress as the relationship between the force (voltage) that generates heat and the SoC

The purple line is a function of the voltage, the blue column is the voltage times 10

The SoC is the red column

You can see that when the SoC is around 50% and the voltage 3.8 approx there is an increasing disparity between what force is available and what power A/W SoC is available.

Similarly when charging, the upward lines you can see a huge disparity between the force used to increase the SoC

Both disparities show stress and heat.

From the few tests I have done it seems the optimum range is 50% to 90%

I hope you are joking? Do you think car batteries are somehow magically different, even though they are essentially just larger lithium-ion batteries? The study even states the goal is to measure lithium-ion batteries rather than electric car batteries in particular:

Therefore, a better understanding of Lithium-ion (Li-ion) batteries, since they represent the heart of the majority of electric cars, during the discharging and charging procedure is crucial.

Just because you can use it for “many years” doesn’t mean the battery wouldn’t be a lot better if you didn’t charge it to 100% every single night and then keep it there all night.

You could drop your phone every day and it would probably be fine, it doesn’t mean it’s a good idea to do so.


Not a joke

The results show that losses, during charging within the abovementioned area, are almost double compared to the 20%–80% SoC area and vehicle’s average specific real energy consumption is almost 2 kWh/100 km more, compared to what the driver sees on the EV’s dashboard. Furthermore, it is not for the driver’s benefit to exceed 80% of SoC during charging, considering the required charging time, the distance that each SoC area provides and the life expectancy of the battery itself.

That’s just a statement with no data or parameters and as indicated
“it is not for the driver’s benefit to exceed 80% of SoC during charging, considering the required charging time”

It’s the fast charging that is the issue and at 80% that will heat up the batteries especially given how many cells there are in a confined space. Cell at the centre get hot.

A phone battery has a different environment and different use so the 80% ceiling is not helpful for everyone, but sure a fast charge to 80 and not 100 may reduce the prolonged heat damage but a slower rate to 90 will probably result in less damage.

Again the 20 to 80 is to get max charge quickly, but below nominal voltage that equates to 50% there’s stress and heat.

use below 50% that’s even moderate drain can be as damaging as rapid charging at any SoC

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Who said I’m loading all night? I only said I’m loading until 100%. And there is degrading over the time anyway, so Li Ion batteries wont last over your complete lifetime.

BTW there is no need to behave rude or aggressive.

Yep, no joke … (like @anon9989719 already outlined above)
One lithium ion battery is not necessarily like any other lithium ion battery.
There are several different li-ion batterie technologies out there and depending on the use (electric vehicles (EV) vs mobile devices; high performance EV vs. long lifespan EV vs. short-range EV vs. etc. …)

Here´s just a very basic overview about the six major types of Li-ion batteries


Don’t worry so much about it. In my experience it’s overrated to be so careful. My old Pixel 3 was absolutely abused battery wise. Wireless charging the whole day, which made it also very hot. In the end the percentage of battery health was the same as someone else that bought the phone around the same time and was anxiously charging all the time. It for sure helps. But netto benefits are not worth it. But YMMV of course.

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The three issues all may cause detrimental heat.

  • Rapid charging from 30% to 90%
  • Charging overnight for hours once it’s reached 100%
  • Discharging fast and below 40%

New features are always nice. As long as you have the option to use it or not.
I personally don’t need it, but I think it’s good if something like this is installed.

I wouldn’t. Better install it first on a spare phone to see how much you like it.

NEVER do it on your main phone or without having some fallback.

And beware: Flashing ROMs can become an addictive habit! :stuck_out_tongue_winking_eye:

[Blockquote] 3Fon
![|25x25] [3h]
I wouldn’t. Better install it first on a spare phone to see how much you like it.
NEVER do it on your main phone or without having some fallback.
And beware: Flashing ROMs can become an addictive habit! :stuck_out_tongue_winking_eye:

So you think flashing can become addictive ? :wink:
Why is that?
Thanks for the warning though, so I won’t install another Os.

Btw: For everyone concerned about the data-protection-non-google-aspect IODE offers:
I found a way to miminize trackers by installing the new tracking-protection app from DuckDuckGo.
That blocks all trackers and tells me which are the worst apps
(so I usually deinstall them again).