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Oct 8, 2015 8:27 PM in response to phoneuserby Grant Bennet-Alder,Your battery charges strongly until it reaches about 80 percent charged, then the charge rate is reduced to trickle-charge levels for the rest of the charging. I have never read anything that indicates whether the charge indicator on the power adapter turns green at that point, but I expect that it may, because the power drawn from the power adapter drops dramatically at that point.
I don't see this as a Bug. Your Mac is taking care of you, and it seems to be doing a good job.
About Mac NoteBook batteries -- Apple Support
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