I was on Catalina 10.15.6 on MAcBook Pro yesterday and my fan started making too much noise and the battery was down to 7% from 90% in 20 minutes. I closed all the apps and still it is the case.
Later looking at few similar posts I tried the update to 10.15.7 which was popping up on systems. The build is 19H2.
The issue has not gone. Tried to connect to apple support but didn't get any useful answers.
Can some one please help.