I'm experiencing some frustration with Bug Sur and I wondered if this is something anyone else has experienced..
Essentially - I've noticed that when the battery goes below 10pc, it doesn't notify you. So, you can be working away in full screen (which I do, frequently) or in the middle of work calls and the Mac just "dies".
In Catalina a notification came up saying that your battery was low and to plug it in - but not Big Sur (yet)
Please, put this back in - I don't want to have to keep checking my status bar all the time
Hi, I've experienced this too and I found a work around that helps me quite nicely. And you can add a personal touch if you like.
There is an accessibility setting where you can have announcements spoken to you. In the accessibility preferences, go to spoken content and check speak announcements. With options, you can choose from a few default phrases or add you own. It won't tell you that your battery is low but it is a noticeable enough sound to tell you to check for the battery announcement. I was even in the other room about to make dinner and I heard it go off.
Hope this tip is useful. :)