In What are the green columns/lines mean in Activity Monitor - Energy - Battery?, the answer tells that green shading in the Activity Monitor battery graph indicates charging time.

However, the Battery system preference shows a different charging pattern, which is a more accurate representation.

The Activity Monitor graph wouldn't make sense since the charge level is not increasing in the green shaded area. Is this a bug or does the green shading mean something else?

Screenshots below, taken within the same minute:

activity monitor battery settings

System information:

  • MacBook Pro (Retina, 13-inch, Early 2015)
  • macOS Big Sur (11.6)
  • The activity monitor readout is older and less accurate. It is filling in blanks with (incorrect) information.
    – Ezekiel
    Commented Sep 24, 2021 at 22:50
  • @Ezekiel that would make sense, is this documented anywhere?
    – victorlin
    Commented Sep 24, 2021 at 23:03
  • Not that I know of - this is just based on experience
    – Ezekiel
    Commented Sep 25, 2021 at 2:57


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