Asklemmy

Charging limit features exist for a reason and not just in phones. EVs have the same problem with charging over night. The best thing to do is not to drain it too low or charge it too high. The orange line (65-75) is probably not realistically doable, but the purple (45-75) should be doable for most people that arent constantly hanging on their phones.

As you can see going low is not as bad as going high because 25-75 is much better than 50-100 even tho the difference is 50% in both cases.

https://www.ifixit.com/News/90983/why-charging-your-gadgets-over-80-is-such-a-bad-idea
https://www.roulonselectrique.ca/en/toutes-les-actualites/recharger-son-vehicule-electrique-a-80-ou-a-100/
https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries

"Bad" is relative, but it does reduce the long-term lifespan of your battery. Ideally you should charge to 80%, but if you actually need the 100%, I wouldn't worry about it either.

That's conventional wisdom for lithium ion batteries. Keeping it between 20 and 80 percent will extend its life. But that doesn't mean charging or discharging it fully will be bad immediately; the effects are small but cumulative. And while battery tech improves, this guideline will probably be less important.

My phone has a option in battery settings for setting max charge to 80%.

Modern batteries, with modern chargers really don't care how you use them. The differences are negligible between methods of charging. There are several vids, I think a couple were even posted here that are doing deep dives into charging and they all come to the same conclusion, it really doesn't matter any more.

The only difference is if you leave a device plugged in, capping it at 80% or less will minimize wear and tear over the long haul.

Yes. 74% is the “average” point of diminishing returns to preserve the battery, according to Accubattery's data. It tracks charging cycles and battery wear across many thousands of smartphones.

In fact, the reason many phones/gadgets don’t offer this feature (and that Apple sometimes charges to 100% in spite of the toggle) is likely planned obsolescence.

…To add to this, the actual charging threshold of the battery is a bit arbitrary and set by the manufacturer, as a tradeoff of capacity vs life. Fast charging is the same; charging quickly is hard on the battery, and the limits at different charge levels are configured as a “balance” between convenience and life.

…And sometimes they get those thresholds wrong.

Like Samsung rather infamously did for the exploding Galaxy Notes. Google did for the Nexus 6P. They pushed the batteries too hard and borked the phones.

I'll just link this video: Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones

https://youtu.be/kLS5Cg_yNdM

Though obviously limited by ressources it's going, in my opinion, a great direction.

I sorta assume software takes care of this type of thing at this point but maybe im wrong.

Yes.

Simplified and probably inaccurate explanation: 100% & 0% wears at the "membrane' that keeps the two energy compounds apart. Charges afterwards don't reach 100% as easily, or not at all. Charging to 80% puts less strain on the membrane as it keeps the two energy rich compounds apart. 50% is best, especially if device is always plugged in. At 50% the membrane is under the least amount of stress.

*Molten batteries *are the only ones I know that solve the problem, but they're the size of a house and meant to power cities.

Also we're finally starting to see devices acknowledge this issue. Phones now only charge to 80% overnight then go to 100% shortly before your alarm goes off. And always plugged in laptops can be set to 60% charge to preserve the lifespan of the battery.

Yes.

After I replaced the battery, the tech told me that charging it over night is what's bad.

Don't put it on charge and let it sit at 100% for hours.