I work from home & am light-medium user that’s satisfied with battery life.

I have a routine that enables power saving when my Flip 5 is closed & disables it when open. I keep my phone closed when I’m not using it - mainly because I don’t want to worry about damaging the inside screen accidentally.

I also have Adaptive Battery enabled, Performance Profile = Light, Display = Dark Mode & use dark wallpaper on inner & outer screens.

You might find more feedback too from folks over in r/galaxyzflip.