[bluk]

I don't believe Apple has released empirical data, but Apple has optimized phone charging built into recent versions of iOS (Settings > Battery > Battery Health and Charging). It will stop at 80% and then resume charging to 100% about an hour before you start using your phone every day. iOS tracks your daily habits to determine the start of your day.

In the most recent iOS versions, if it can determine when "clean energy" is available near your location, it will also try to charge only during those time periods. I don't think any 3rd party has determined if it is effective.

[alpaca128]

This feature exists in Macbooks too, but it's useless to me - it never works because apparently my usage pattern doesn't convince the smart system to limit charging, and it gives me no manual control whatsoever. I think I'd have to always keep charging the laptop for it to kick in.

Just gimme a slider that lets me tell it to only charge to 80% and be done with it.

[andrewaylett]

At least some Android devices have the same, it keys off your alarm if you have one set. My Pixel 6 Pro will also take advantage of chargers' ability to supply different amounts of power to not charge as quickly as it's physically capable of doing if it thinks I've put it on charge for the night.

[ewoodrich]

My iPhone 12 mini spends 95% of its life on a MagSafe charger and has never charged to 80% after a year with this setting enabled. I wish Apple would add an explicit option like "Protect Battery" on Samsung devices.