I face the same problem, after upgrade to Big Sur 11.1 the battery icon showed 1%. Also, it can not be charged, I must plug the power cable all the time. I contact the online service they didn't see the same issue, and can not solve the problem. After reading this, I have reason to believe, this is a software issue rather than the hardware. I wish the next upgrade version that can fix this issue.
itscriptor
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