Many MacBook Air, MacBook Pro, and MacBook Neo owners have noticed something curious; their MacBook battery stops charging at 80% when plugged in. Why the MacBook Stops Charging at 80%Why the battery stops charging at 80% is due to a feature called Optimized Battery Charging. While the Optimized Battery Charging feature is the number one reason a MacBook battery will stay at 80% or stop charging there, there are other possible explanations as well. Checking your MacBook battery healthYou can check your MacBook battery health at any time from System Settings by going to  Apple menu > System Settings > Battery > Battery Health. Remember, for most users the MacBook battery stopping charging at 80% is normal expected behavior, as part of Apple’s built-in battery preservation system.