This guarantees the battery won’t be under too much stress from the high voltage required to hit 90 or 100 percent.Ĭarefully managing your battery is work, and most MacBook owners don’t need to get too in-depth. Ideally, you’ll want to run the cell down to 40 percent before charging it back up to around 80 percent for best results.

That’s why it’s a good idea not to leave your machine on the charger all of the time. If your laptop never leaves your desk or you have a particularly erratic schedule, macOS may not be able to pin down when to delay charging your battery. The aforementioned Optimized Charging feature takes some of the sting out of leaving your laptop plugged in, but it’s not infallible.

The one exception to this is if you start to notice the battery bulging, which is a serious problem that could result in harm (tell Apple immediately if you notice this). If you leave it plugged in all of the time, the battery won’t overheat or damage any other components. It’s not possible to “overcharge” your MacBook battery by leaving it plugged in. Don’t Leave Your MacBook Plugged in All of the Time This works identically on the iPhone and iPad. If you happen to leave an hour earlier for some reason, you might find that your battery isn’t fully charged. So if you charge your laptop overnight and leave for work at 8 am every morning, your MacBook will wait to top up the final 20 percent or so. The mode was first introduced in macOS Catalina so if you try updating and your Mac is not compatible with this version of the OS then you’re out of luck. Once your Mac has learned your daily habits, it will wait before charging your device fully so that the cell spends less time at 100 percent.

You’ll find this setting under System Preferences > Battery > Battery. Many companies have adopted such charging modes, including Apple. Battery University recommends that “a device should feature a ‘Long Life’ mode that keeps the battery at 4.05V/cell and offers a of about 80 percent” to prolong the life of the battery.

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