Same problem, the battery was working perfectly before updating, now it’s just stuck at 1% and when moment I unplug, it turns off, this is a serious problem and needs to get fixed asap

been weeks and I still have the same problem, battery not charging and the moment I unplug, mac dies. shows the battery is at 1% and needs services, before updating to big sur, battery was working perfectly with no issues, there's no way the battery has any issues.

Downgraded to Catalina, still having the same problem, battery stuck at 1% and not charging, unplug and macbook dies, fix this Apple! Mac was working perfectly fine before upgrading to Big Sur.