i have found the work around! I've re-paired and turned off gym equipment long ago and was only getting about 10 hours from my series 2 watch.
I forgot my phone at home this morning, and using my watch all day for things I could to on my phone if I had it, and using WIFI on my watch, I came home 10 hours later with 67% battery REMAINING on my watch. Before today I was getting about 10 hours before power reserve.
I think iOS 11 is to blame. I haven't had battery life like this since installing watchos 4. Im leaving Bluetooth on my phone OFF till beta 3 comes out, and running wifi only on my watch.
I also noticed that turning Bluetooth OFF in the shortcut screen didn't actually disconnect my watch from my phone. I had to go to settings>Bluetooth and turn it off there to actually disconnect my watch from my phone. Anyone else have that problem?