Its literally just a control file that has "charging enabled 0" or "charging enabled 1". Its not missing because the team lacks the resources to do it, as its super simple "feature". Its not here because of the team's personal opinions on this.
By the way i stopped doing this because if i always limit it to 80% then ill use 80% of my battery instead of 100% which is literally the same outcome if it would have degraded by itself.
someone1223 also disable fast charging
You can disable fast charging by putting it on a conventional charger. The PMIC will still regulate the charging to prevent overcharging, it will just take longer to get to full.
The project account has recently said they might add the option to disable fast charging: https://grapheneos.social/@GrapheneOS/111829826834757260
someone1223 I have been waiting for some time for GOS to implement somekind of battery protection features. But doesn't need to be smart or adaptive like stock, a simple 90% charge limiter at night would be enough.
A chargie.org dongle + app does exactly this plus more. It's an external Bluetooth controlled switch inserted between the power source and phone, which shuts off the charging at your preferred limit, then keeps it charged to that, discharging to a programmable lower limit before it starts charging again. e.g stop at 85%, restart at 80%.
After using a Chargie for 14 months on my new P7P it reports about 0.3% battery capacity loss. I try to keep my battery at 30% - 84% charge and only ever slowly charge it (the Chargie itself limits the charge current).
Heat kills batteries. Use a standard 2.4W charger whenever you can, not a PD fast charger (or use it with a Chargie dongle).
There have been plenty of discussions about this on this forum; you should use search and read them.
other8026 Pretty interesting. How would this reduce attack surface?
I would 100% support a mechanism to limit charging to a certain percentage! It would be super easy to implimet, if the coments aboe are true. Regardless of the GrapheneOS team member's feelings on the subject, it would be great if they would do this for the thousands of users that feel otherwise...
There is some good data that shows that what is written here is not the whose story!
Look at these articles to see data on how to prolong lithium ion batteries from 500 cycles of charge, 0% to 100%, to a few thousand charge cycles 0% to 100%, not 0% to 80%. There is science behind why we want this feature!
Thakns!
Phones already limit their charging levels. 100% is not 100%. Keeping the phone in a charger all day will make the batter last longest as the phone will run off the charger instead of the battery.
Just read akc3n's post it explains everything.
This has been discussed previously, and it's always contentious for some reason. I don't really have a dog in the fight. I'm happily using GOS without charge level limiting, but I have always found it confusing that there's a lot of opposition to offering it. From what I've read in the literature, I've only seen papers showing upsides to charge limiting, and I've not seen any showing any downsides. But, a lot of people seem to be down on it nonetheless.
It reminds me of the people who hate wireless charging. When it first showed up on phones, some people were adamant that it was the dumbest thing ever. I never understood why they just wouldn't ignore it and use wired charging if they hated the idea. Sure, wireless charging has issues, but its mere existence wouldn't seem to be one of them.
I used to use a Galaxy Tab A 2019 for torrenting until it stopped getting updates. While torrenting, it would be plugged in for days or a week at a time.
I still use the tablet daily for off-line games and haven't noticed any battery issues.
I used to stop charging at 85% for all my phones but I have enough evidence (at least for me) that leaving a modern android on charge is a non-issue.
[deleted] in that case if you do the same on pixel with grapheneos after something like 2 or 3 days it will start discharging from 100% and then stay at 80% with a message "Charging optimized to protect your battery" it is a similar but different feature from the one that OP speak about
collector yea i edited that message, but multiples brands say the same, i know of Apple, Google, Samsung and Huawei at least, i have read the same in the huawei p8 manual despite of it not having that feature at the time they still recommended to charge it to 80%, so i'm not sure what to think about it, why would huawei said that if they didn't even had a feature to limit the charging at that time?
anyways i would not use that feature so i don't mind, i just charge to 100% and unplug
collector So, I gave it a read to the article attached in the link and first of all thanks akc3n for detail explanation. But, I do have a doubt regarding the wireless charging overnight :
As explained in the article, when the device is 100% charged and the lockscreen is displaying the status as "charged", the battery is in idle maintenance mode and the phone is powered via external source (here in my case apple magsafe charger). I know, for sure, that when magsafe charger is charging something (especially mobile phones), it tends to get warm. But, when I wake up in the morning, I see my phone on the charger at 100% and I find magsafe charger at room temperature.
This observation does not sit well with what was mentioned in the article, as if the phone was getting its power from external source and not battery, the magsafe charger should have been a ltl warmer than room temperature. Could anyone explain this or mention something which I am missing right now?
dsjvhjdjhgvcjhsdc More current --> more heat. While the charger is just supplying enough power to keep the phone on, it is supplying a lot less current than while also charging the battery, hence the heat generated is a lot lower. Keeping the phone on draws very very little current.
The charger should produce far less heat than a discharging battery, since there is no chemical reaction, therefore I wouldn't expect to be able to detect any heat from the charger just by touch in these circumstances.
I really hope to see this feature in GOS.
I have personally noticed a big increase in the battery life (over time) of my devices (laptop, smartphone) since I no longer systematically charge them to 100%.
My 2015 Dell XPS Laptop still has its original battery and still lasts several hours unplugged. The BIOS generally prevents charging beyond 90% and in any case does not allow charging to be resumed when the battery has not dropped below a certain level.
Here we have people confusing the possibility of limiting charging with the role of the bms.
The bms, which is hardware, protects the battery by preventing overcharging, deep discharge, overheating, etc. But it's not a charge limiter. There will be no danger in charging your battery to 100% every day, but its lifespan will be shorter.
On the other hand, I strongly doubt the usefulness of not using fast charging (apart from safety issues).
The Pixel range is already very conservative in terms of fast charging, and above 50% the charging speed is significantly reduced, and the temperature is well controlled.
Phones already have this! If you are on a USB-C PD charger (atleast with the official one) it will give the device just as much power as it needs.
If the battery is charged, this means the phone will not even use it but run off the charger.
We dont need such a charge limiter as there already is one.
missing-root You don't need a PD charger to gain charge protection. Charge limiter is part of the PMIC inside the phone.
missing-root Unfortunately, this clear-cut opinion on battery use is only shared by Graphene Os.
They talk about a bms that protects the battery, but they say you need the Google charger. The bms protects the battery whatever the situation, even when it's not being charged!
Of course the battery doesn't stay in charge once it's at 100%, but that's not the problem.
The majority of devices with lithium batteries have the option of limiting charging, precisely to avoid premature wear and tear associated with constant full recharging.
Examples include ecoflow batteries, recent Samsung phones, electric vehicles, even some flashlights, etc. But of course, a pixel with Gos is not concerned. 😏
The difference between a bms that protects the battery (but allows a full recharge cycle) and a charge limiter doesn't seem clear to everyone.
Some sources related to the AccuBattery project: https://accubattery.zendesk.com/hc/en-us/sections/202397985-AccuBattery-Research-and-Methodology
missing-root I've heard a lot of people say this (and yes, I've read akc3n's article in full many times) but I haven't seen any proof.
Much research has been done (already linked) showing that a charge level of around 4.05V/cell provides extreme benefits to total battery life (not just cycles but total lifetime).
I'd like to at least see some data showing that this is the maximum charge given to e.g. Pixel phones at 100% based on the actual phone or a reliable app reporting as such. In my experience the charge at 100% is 4.2v or higher.
If someone can show that Pixels are limited to 4.05v then I'd be impressed.
I think a feature that would shut off a phone at 25% would be worth adding as well.
