I have a 2016 MB Pro which I purchased in 2017. Last year I started getting a service battery message, so I had it done at the Apple Store last November. The battery now appears completely dysfunctional after only 30 cycles; it completely fails to charge and this is visually signified with a red X. I get the "service battery" message as well, but the nominal capacity of the battery is indicated as basically new. The machine was running fine and this problem appeared immediately after upgrading the OS to latest Montery around a week ago. The computer is not abused and I followed best practices battery maintenance. What could have caused this? Upgrade breaking something? Some mechanical shock? It slipped off a bed some months ago but worked fine for a long time afterwards and with no apparent problems. I'm trying to decide if I should fix it again with the Apple Store for another $200.00 but I'm afraid of a firmware problem with the OS or maybe a cracked connection to the system board. Any ideas? Would mechanical damage be apparent to the repair techs? $200 for ten months of new battery life doesn't seem like good value. Any thoughts appreciated.