When the MacBook Pro's battery is fully charged and plugged in to the mains, is this damaging the battery or is the device running off the mains power alone?
I can get a bit funny about battery discipline and was wondering what's best for my battery in the long run; leaving it plugged in when on 100% or as soon as it reaching 100% unplugging and running it from the battery?
MacBook Pro (13-inch, 2017, 4 TBT3), macOS High Sierra (10.13.5)
Apple have used "smart batteries" for years. When the charge reaches "full" charging stops an stays stopped until normal drain drops the charge to about 95 percent, when charging resumes.
Don't obsess over the battery. I follow these guidelines and simply enjoy my MacBook Pro:
1) Use the computer on battery sometimes. I try to do so at least once a week. Posts of early battery failure here often start with ,"I don't understand. I never use the battery!" We have seen batteries that were used all the time last to almost twice their rated lifespan of 1000 cycles.
2) Don't routinely run the battery to zero. An accidental rundown or two is not going to hurt but your best action is to put the charger on when you are in the 20-40 percent range.
3) DON'T CALIBRATE!!. Some well-meaning posters here have outdated bookmarks that include instructions to calibrate the battery. This ceased to apply when Apple went to built-in batteries around 2009†. Doing so violates the "don't run to zero" rule above.
† -- Reference: OS X Mavericks: Calibrate the battery in a portable Mac; second paragraph
Oh cool, thanks for that 🙂
Really helpful
MacBook Pro Battery
