Experiencing battery drain on Apple Watch after installing iOS 13 beta public 4 (on iPhone 7) + WatchOS 5.3 (on a Series 4) — I've been using the watch the same way I did the last few years.
Normal usage often leaves me with 50-60% battery left after a day at work. It's down to 10% now.
I go to sleep with a full charge, and usually wakes up in the morning with about 95%, now it's 70%.