karmakaze
9 hours ago
I'm on macOS 15.0.1 and it's built-in. See Battery -> Battery Health in System Preferences, then click the (i) on the status display. It will show a dialog with an option for "Optimized Battery Charging" that charges to 80%.
The option may also have been in earlier versions, I don't recall.
starbugs
6 hours ago
This option is not new and it never really worked for me. Sometimes it would work fine for a while, then again it decides to keep the MacBook at full charge for weeks. I never really understood what Apple had in mind with this feature. Just give us a proper charge limiting option. With this tool you get exactly this, though limited to choosing 80% or off (charge to full) only. I would prefer a full charge limiter as I have in my Tesla, but for some reason that's beyond Apple.
rahimnathwani
9 hours ago
The linked page mentions this:
Additionally, Optimized Charging uses machine learning to decide when the battery should be held at 80%, and when it should become fully charged.