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My MacBook Air has
been turning off even at 77% capacity. I now get the following message: The battery's capacity is significantly reduced.. To restore capacity, please check your service options. This computer is know more than 3 years old. Any suggestions
MacBook Air 13″, macOS 11.1
Back on Dec-20-2020, I got the same "important battery message" on my MacBook Pro (MBP) that I had bought in 2016. At the time, I saved the screenshot but didn't do anything about the message. For awhile, I noticed that the battery icon never went to full capacity. However, now the icon shows 100% charged but when I click on it, it says "battery service recommended".
EDIT: I just found this apple page on mac batteries, which is very helpful: https://support.apple.com/en-us/HT204054
Kind of interesting, obviously a slight change in displaying the error happened. Since my MBP is always plugged in, I guess I will continue to ignore this message. The 2 screenshots from Dec-2020 and today Feb-2021 are shown below
Battery message in Dec-2020
Battery message in Feb-2021
The battery needs to be replaced. Apple charges $129 for the service.
important battery message
