I have the Note 9 (SM-N960U) used on AT&T. Last week the phone updated to Android 10 (N960USQU3DTA4). Ever since this update, the battery life has been pretty bad. Before I could get about 7 hours of screen-on time with 16 hours of stsandby time. But now with Android 10 my screen on time is about 5 hours (2 hours less than before).
This is pretty bad, and needs to be addressed by Samsung.