General > General Technical Chat
Battery overcharing
PlainName:
For reference, I would think that big name manufacturers would know about the product they are shipping. Here's a sample:
Xiaomi (my emphasis)
--- Quote ---Avoid full charges
Li-ion batteries work best when the charge span is between 20%-80%. Going from 80% to 100% actually causes it to age faster. Consider the last 20% as extra in case you are not free to put your phone into charge but do top it off by charging as long as you can. Li-ion batteries works best in the middles.
This is not to say you should never fully charge your device of course, because we do need it at times like for battery calibration or whatever reasons you may have however you should always keep in mind to avoid it. It goes without saying that charging over night is not a great idea unless you are controlling the charge flow like stopping it at a certain battery level.
--- End quote ---
Nothing Tech
--- Quote ---6. Avoid excessive charging
If the mobile phone is fully charged, the charger will be maintained in a full power state. This may cause battery deformation and the leakage of the fluid. The performance of the battery will also be significantly reduced and damaged.
Do not exceed 12 hours continuous charging time. When the phone prompts are full, you should unplug the charger.
--- End quote ---
Samsung
--- Quote --- Unplug the charger after the device has reached a 100% charge to avoid a swollen battery
--- End quote ---
OnePlus
--- Quote ---You should not charge the battery for more than 12 hours. After the phone is fully charged, unplug the charger.
--- End quote ---
PlainName:
--- Quote ---What is your new phone?
--- End quote ---
It's a Nothing(1). Current phone is a Xiaomi A1. Been trying to find a suitable replacement for some time, but nothing (not the phone!) ticks all the boxes yet.
Kim Christensen:
--- Quote from: PlainName on December 24, 2023, 12:12:37 am ---For reference, I would think that big name manufacturers would know about the product they are shipping. Here's a sample:
--- End quote ---
Interesting. I wonder how much of this is just them covering their asses in case something goes wrong and things catch on fire.
Like the OP said, it seems pretty stupid that a "smart" phone can't manage it's battery properly.
PlainName:
My guess is that a simple battery charging chip is used, which basically allows charging at some maximum rate and reduces to a trickle, or keeping topped up, when they battery is up to some specified voltage. As such, it's 'safe' in that it's a controlled charge, but it's not controllable by the phone per se. It's hardwired.
Some devices - Apple, presumably - add the necessary stuff to allow the phone to affect the charging, perhaps the rate and certainly the termination. Obviously, that would cost more and not be as simple as just using a charge chip.
Siwastaja:
If you want true, real lifetime increase, you:
* Keep the battery significantly less than fully charged. 95% or 90% does not cut it. Go for 60-70% and below.
* During charging, avoid the combination of high state-of-charge, high charging current and cold temperature. You can pick one pretty safely. Pick two, and lifetime decreases significantly. Pick three and it's a disaster. Products of course do manage these things automagically and prevent very bad conditions (e.g., limit charging current at cold temperature; slow down charging near full), but they are not too aggressive to limit your use. If you want to optimize the lifetime, it's good to know these relationships so that you can manage more strictly than the product firmware does.
* Avoid storage at high temperature and high state of charge.
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