I always hear that it’s bad for lithium batteries to charge over 90% or over 90% so why is there no setting to stop charging after a certain threshold on my phone, kindle, pc or e-skate?
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It’s not quite that simple but the answer is: They do.
Lithium battery charging has to be managed by circuitry (older battery techs you can pretty much get away with just applying voltage, but with lithium that’s not safe). Your laptop, phone, etc. already do exactly what you say, but they know when to do it and how.
There is, some smartphone manufacturers have those options in the settings, others will integrate some safety measures that are not selectable. One thing they all do is slow or stop charging if too hot.
My ASUS phone allows for:
Speed of charge – too fast isn’t good for the battery, but might be needed by the user, when connected to a fast charger you can slow down the rate of charge.
Charge limits – what OP asked, you can set how much will the phone charge to, 80% is what I have mine set to.
Scheduled charging – you don’t need to worry about leaving it charging overnight to have a full charge in the morning, it will slowly charge up to 80, then trickle charge until near the scheduled end time where it will continue to charge up to 100.
Low battery warnings – going low battery isn’t good for a Li-Ion battery either, you can set when it asks you to charge and if you want to go into power saver automatically.
On my laptop you can tell it to stop charging at 90%, although the behaviour is a bit less consistent as it depends on the OS software, BIOS and BMS firmware…
There is. It’s popping up on phones already (samsung ZFlip3. Charge limited to 85% of battery capacity) 😉
So oppositely its bad for lithium batteries to be fully drained. Just a number im gonna pull out of my ass because google takes too much time: Lets asume the lower limit is 20% charge and upper limit is 90%. You want your phone to opperate in that range 20-90% which is a total of 70% of the max capacity.
So you set your lower limit 20% to be equal to no charge “0%” and define 90% to be equal 100%.
Thats what your phone shows on the top right. Not the actual percentage of capacity but the operating capacity.
Because it is handled automatically by the device. The “percentage” of power shown on your device lies all the time. It’ll say “100%” but it’s really sitting at 85-90% depending on the model. It just shows it’s at 100 because your average consumer doesn’t know to not overcharge a battery and they didn’t want to get a deluge of complaints from people saying their battery won’t charge to full.
If it has a lithium battery, it manages its own power levels (or the charger handles it).
Note20 ultra has an 85% limit option which makes me think older phones didn’t. Basically it is putting stress on the battery if you keep filling it up but phones already having low battery life i think they were disregarded up to now. I wish my laptop had the same option. The note8 doesn’t have it. But in diagnostics you can check the actual voltages, somewhere, not sure exactly rn, which should help you see if the reporting is correct
Lenovo is one of the few laptop manufactures that have this feature. You have to download Lenovo Vantage, then you can turn on “Conservation Mode” and it limits the battery to max 60%.
It’s not-yet more popular on more laptops, because it has to be implemented at a hardware and bios level. This is one of the rare cases of “planned obsolescence” I actually agree is purely nefarious.
I have a Samsung phone and a Dell PC and both have this feature in the settings.
The Samsung let you stop the charge at 85% and the Dell at 90%
These batteries come with safeties already built in to prevent damage and increase battery life-span.
The 100% it tells you is not actually 100%, it’s closer to 90%.
The 0% it tells you is closer to 5%. Proof: if your phone dies, try turning it back on. The screen will light up to tell you there is no battery.
There have been other improvements done to batteries over the years too, like how they charge. Instead of having the power supply in the phone, they instead put it in the power bricks you plug into the wall. This keeps the heat away from the battery.
If you’re wondering why “my phone from 6 years ago lasted me around the same amount of time that my current phone lasts me”, it’s because your newer phone has newer tech that is more power hungry. A faster phone with a nicer screen means more battery drain.
so the answers here will tell you that “some phones have settings to automatically limit the charging percentage of the battery” but won’t give examples of such phones neither tell us where that option is on those phones xd
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