That is bizarre. The watch I bought in 2020, lasts me two full days. I go running between 30-60 minutes every day. Battery life has never been an issue for me, and it almost even feels like an old nokia in terms of battery life.
However, I turned off almost all notifications on my watch because they are mostly annoying, except text messages and protonmail. I turned off the “always on” watch face. I keep a very small subset of apps on the watch.
I also don’t have a cellular version of it, wifi only.