Same issue, but seemed to happen after last Catalina update before Big Sur. Battery says service recommended, won't charge and stuck at 1%. 265 cycles, coconut battery says 85% state of health. PRAM and SMC reset don't fix. Computer won't power on after SMC reset without unplugging and replugging charger. Diagnostics give error code PPT006.
Apple support says buy new battery. Everything worked fine before last Catalina software update. Reinstalling Catalina, Mojave, Big Sur all to no avail. If it's an SMC firmware update issue though, I don't think rolling back the OS also rolls back the firmware. Big Sur 11.1 no help.
Very frustrated.
MacBook Pro (13-inch, 2017, Four Thunderbolt 3 Ports)
SMC Version (system): 2.44f5
steve-o_jobs
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