I bought a new battery for my Macbook. Besides not giving an accurate indication of the battery (due to a calibration issue I guess), it gives a different value to the Mac and the coconutBattery. What could be the reason?

coconutBattery screenshot

  • "due to a calibration issue" - how did you calibrate it?
    – Tetsujin
    Aug 21, 2023 at 11:59
  • @Tetsujin TBH I had not known this term till today, what I have been doing is to drain it off completely and then charging again, it initially was showing 100% right after 100% but I kept charging which let it reach to 99%
    – Volatil3
    Aug 21, 2023 at 12:21
  • See this method - ifixit.com/Wiki/Battery_Calibration
    – Tetsujin
    Aug 21, 2023 at 12:24
  • 1
    @Tetsujin I thought that this was only necessary some years ago; Apple no longer recommend recalibration. I certainly wouldn't run it down once a month.
    – benwiggy
    Aug 21, 2023 at 13:04
  • @Volatil3 Apart from the difference between the OS and CoconutBattery, what do you mean by it does not give an "accurate indication"...? As long as you get, say, 5 hours or more for medium workload, and the battery stays good for another 3 years: then there's not really much more you can do.
    – benwiggy
    Aug 21, 2023 at 13:07

1 Answer 1


Coconut Battery and Apple use different methods to calculate the percentage.

The Coconut Battery FAQ says:

iOS uses a defensive calculated battery capacity value to define 100% (and the percentage calculation). coconutBattery reads out the raw battery data and can give you more precise information. (for example you will see that the device actually is still charging when iOS tells you that it is fully charged).

(It says iOS, but the principle is the same.)

A quick Google shows lots of people asking this question.

Any figure is going to be a rough guide rather than a measurement that you can use in any accurate determination of anything.

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