Galaxy S9 vs. Galaxy S9+: Which Phone Should You Buy?

But how much battery eating junk is on this phone... that kicks in a few weeks after you buy these new phones?

Has anyone noticed this? Battery life drops after a short time of ownership?
 
A hundred more for an additional camera, 50% more memory, and a bigger battery makes sense.

I get an average of 20 hours per charge when Surfing, Tubing, and background APPs - screen brightness ~40%.