Battery Service warning. Manufacture date 1979 in Big Sur and Monterey.

[RioRio]

Hello

I have a Battery "Service recommended" warning on a 16" 2019 MacBook Pro (A2141) in Big Sur. The Battery has 290 cycles. Coconut Battery shows the manufacture date 1979-11-30. I have upgraded to Monterey and there is the same issue. Then I've downgraded to Catalina and everything is normal again. No service warning and Coconut Battery shows 2020-03-26. Then I upgraded back to Monterey and it shows again 1979 and the warning. SMC and PRAM reset did not help. Neither did a battery calibration. Is there any fix for this?

Thank you!

 

[2informaticos]

Many people complain on Internet about this Big Sur issue.
Some of them claimed that Big Sur last version solved it.

Google Search

Just in case, try DFU restore when the problem appears; then upgrade again.
Save any data first...