My phone’s battery backup is pretty good. Overnight drain is generally around 2-3% (around 7 hours). It generally pushes nearly 2 days standby with 6-7 hours sot and battery drain from 84% to between 20-15%. I disabled dijital wellbeing, battery optimization and aod, i use dynamic refresh rate. Also, i use an opensource app to freeze some apps which i don’t want them to works backround when they are not in use such as instagram, reddit, x etc. The app name is hail, you can download from f-droid or over internet(need shizuku). My battery backup is pretty consistent through updates.
I also need to mention that, my nfc, bluetooth, location are off when not in use.