For at least 6 months I've noticed if I allow the battery to drain down to 3% that it abruptly turns off. I do not leave it on the charger all night or use it while charging. The only difference between my use of my note8 vs note10+ is I only ever charged the note8 on slow wireless charger overnight, occasionally using a wired charger in a pinch. Vs note10+ only using a wired fast charger to charge once a day, often never charging over night, rarely on the same wireless charger. They both have service and I use them interchangeably with exception I have not installed all the junk apps from 8 to 10+
Note8 I get about 2 days ~24 hours on average, 5 hour screen time.
Storage is nearly full as well as 256gb sdcard.
Note10+ I get about 16 hours, 6 hour screen time.
Storage is more than half full, 256gb sdcard 1/4 full.
I read mostly and text, rarely YouTube or games. I do listen to music on the non dominant device while reading.