I have a 2019 MacBook Pro 15 inch running MacOS Catalina (10.15.6) which had the top case (battery) replaced in July 2020 due to significant battery degredation over the 1 year I had owned it. The battery health went from 100 % to 84% in just over 12 months.

Since having that replaced, I noticed that the battery health of the new battery had decreased from 100% to 89% over just 53 charge cycles. I called apple support since it still has apple care and they ran their diagnostics on it (Shut Down Mac, power on, hold option + D). The agent said the diagnostic report showed my battery was at 97% health which was within spec. I am just curious why system report would be saying my max charge capacity was at 6502/7336 (89%) yet his diagnostic (which apparently bypasses any operating system measurements) is saying 97%?

I thought this might be an SMC issue and reset that earlier this week but no improvements. Is there some other system that needs calibrating?

  • Did you see his Diagnostic report? Can you post the results? – Allan Sep 10 at 14:32
  • No the recovery mode that I booted into sent him diagnostic information for support technicians. Apparently he can't send the report – Sal Sep 10 at 14:44
  • I don't like to diagnose things by taking another tech's word. You could be trying to fix a problem based on something he misread. Did you ask him this question, specifically about the discrepancy? – Allan Sep 10 at 15:10

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