I regularly get 48-60 hours per charge, on a 2 plus year old Galaxy Watch 4. Over time, I figured out that "dumbing down" some functions really helped the battery life. No auto brightness - I just manually set it usually once for day, and again at night. Turned off lift to view and gestures. Like others, I use mostly the health stuff, no gps, notifications display on all emails and texts, answer a few calls but only when alone and I have no other choice, heart rate monitor every 10 minutes, media controls auto pops. I even have a rotating photo background with 15 pictures currently in rotation. I think turning off the auto sensing for brightness, and turning off gestures may have seriously extended my typical battery life-but your mileage may vary. (And yes, I wear the watch at night, though sleep tracking is still hit or miss for me).