MacOS menu bar tool to limit maximum charging percentage
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When the installation is finished, enter your desired max. charging percentage by clicking on the 🍝 icon on your menu bar. Usually, the operating system will take a minute or two registering the changes, so be patient. You can check if it’s working by setting the max. percentage to e.g.: 80%. After a while, clicking on your battery icon will report “Battery is not charging” if you have more than ≈73% left, even though your charger is connected. Notice that in this state, your MacBook is still powered by the charger, but the battery is not charging anymore.
For some reason, macOS will always try to squeeze in a few more percent than specified. For example, if you set yours to 80% it will stop charging at around 83%, so be patient.
IMPORTANT: Keeping your battery at a lower percentage, such as 20-80%, over weeks without doing full cycles (100%-0%) can result in a disturbed battery calibration. When this happens, your Macbook might turn off with 40-50% left or your battery capacity will drop significantly. However, this is only due to a disturbed battery calibration and not because of a faulty or degraded battery. To avoid this issue, we recommend doing at least one full cycle (0%-100%) every two weeks. Even if your battery calibration gets disturbed, doing 4+ full cycles will recalibrate your battery and the capacity will go up again.