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Released in July 2018, the 15" MacBook Pro, model A1990, features a 15.4 inch LED-Backlight display with True Tone technology, TouchID, and up to 6 Core i9 Processor.

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Wrong battery percentage being reported after battery change

Question:
Any ideas on how to fix so that the OS reports the correct battery percentage?

Context:

  • I changed the battery on my own.
  • The computer charges fine up to what is being reported by the OS as 100%.
  • After disconnecting the power cable the OS will soon report the battery percentage to be 1%.
  • I am able to run the computer fine on 1% for an hour or so.
  • Battery condition is reported as "normal" by the OS.

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Symptom:

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Update (08/29/23)

Thank you for your answer.

I just tried resetting SMC but it didn't help.

CoconutBattery when power cable is disconnected:

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CoconutBattery when the power cable was just connected:

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CoconutBattery when the power cable has been connected for 5 minutes:

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crwdns2889612:0crwdne2889612:0 0
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I would start off resetting SMC and then leave the system to charge over night fully powered off.

I would also down load this Gem of an App CoconutBattery let’s see what it tells us. Post a snapshot of the Apps main screen here so we can see it to.

Update (08/29/23)

@tedlindstroem - Not good! 😞

I would replace the battery again as it does look like the microcontroller within it is defective in this battery. Contact the seller to get a replacement.

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Ted Lindström crwdns2934231:0crwdne2934231:0
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