Whenever I have an unusual battery drain, a cold boot fixes it. I always check the Apple Watch app to look at usage and it is usually high when the battery drain is fast. A run-away app is usually the cause. If you cold boot and it comes back, try uninstalling the most recent third party apps.
I've been using beta 5 since it came out and the battery life has been equal to 1.0.1 so I assume you have a bad app or just need a cold boot.
I fixed my battery issues quite a bit by disabling the active weather complication. That was the major drain that made my watch nearly dead within four hours. It's still going down faster than normal (about 6-7% an hour with barely any use) but it lasts me the day. I can't figure out what's causing it other than the beta