this post was submitted on 10 Mar 2024
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Can't answer the rest of your question because I don't use a one plus but:
No, you aren't "supposed" to charge your phone overnight. Leaving your phone on the charger at 100% is actually pretty bad for long term battery health. Hence why the notification exists in the first place. Modern phones also full charge in like an hour, so this leaves your phone in that state for many hours.
The longer story is it's actually best to stop charging your phone at 80 percent unless you really need the extra juice, because any time your phone spends above that is potentially damaging, but that tends to be hard to deal with for most people.
Most of the phones I've seen with this feature have a "battery warning" or "charge notification" or "protect battery" type setting somewhere you can turn off. But again, I've never used a one plus so Idk if they do or where it is.
None of this is true anymore, kinda. Modern phones now bypass the battery so your charger is actually powering your phone directly. As for the 80% thing, you're correct, except that manufacturers account for that and calibrate such that what you think are 0 and 100% are actually closer to 20 and 80% respectively. And that's not just for phones. Steam Deck, Nintendo Switch, tablets, laptops, etc. Manufacturers learned to not trust their end users to be technically knowledgeable about this sort of thing since nobody reads the manual and the consequence could be fires or explosions, and that's gonna hit the news without nuanced details, and that's then gonna tank their company's stock value. They found that it was just much more stable and profitable to include some basic lines of code to feed you comfortable little lies that keep you safe :)
It's actually the other way around. A safe cutoff voltage to prevent battery degradation is about 4.2V, but most modern phones charge until 4.45V, so they can advertise a bigger battery capacity at the cost of long term battery health. Your phone essentially charges itself to more than 100%