[crazygringo]

Kind of, it's described here [1].

But that only applies if you have a "charging routine", e.g. you always charge overnight and use it on battery all day long starting at 9:15 am:

"When the feature is enabled, your Mac will delay charging past 80% in certain situations. Your Mac learns your charging routine and aims to ensure that your Mac is fully charged when unplugged."

But in my experience, the feature doesn't do anything if your Mac is just usually plugged in. It simply stays at 100% because there's no routine for it to learn for when you tend to unplug it.

[1] https://support.apple.com/en-us/102338

[ein0p]

Useful info, thanks. There’s really no reason for my MBP to be charged 100% - I rarely unplug it