Good evening, I own a MacBook Pro 15" late 2016 and a couple of weeks ago I updated to OS Catalina with also first official update some days after launch.
I noticed that since Catalina runs on my Mac the battery life has decreased a lot, about 80% less than before !
With Mojave the average battery duration was about 10 hours, now not more than 2,5 ! Really unbelievable.
Of course I made a full check up and test's results are ok, also battery is ok because the completed charge cycles are only 210 on 1000 as on Apple official technical support site.
So I can't think about any other explanation if not that this problem has been caused by OS Catalina.
Did anyone else notice the some behaviour after updated to OS Catalina ?