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.

big sur battery service recommended - Buscar con Google

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