I have the Apple Watch 5 and my watch USED to last two days and now I have to charge it every day. People will say "Well, Apple Watch 5 is very old, so maybe your battery health is affecting it." Nope. This is a replaced watch with a new battery that is at 100% health.
I have most things turned off like: wifi, location, screen dimmed to last notch, none of the health features turned on, none of the exercise features turned on, no apps running in background except messages and phone calls, I have no apps installed, handwashing off, heartbeat off. I have everything on bare minimum.
I am hoping that Apple will take notice and release a patch for this. Sadly, the Apple Watch series 5 is no longer supported when it comes to WatchOS 11, but they should still update it because of the bad battery life. I hope.