Same issue after installing Big Sur, battery 1% and not charging: service needed. MBP 2017, only 93 charging cycles. Support says that I have to buy a new battery without any compensation. I tried to do a clean install, after formatting the HD the battery suddenly was 98% charged, but after re-installing the software (Catalina) it was again 1%. So, it is definitely a software issue and not a hardware problem!
PeterNL
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