My watch updated to 7.3.3 two days ago. Noticed battery drain the next day. Thought it was a fluke. I measured the battery drain today. Over the last 2.5 hours I am am averaging 1% every 7.5 minutes. So if you do the math 750 minutes on one charge is about 12 hours. Seriously??!!?? Trying @Harvey_Specters temporary solution now. I know Apple doesn't monitor these forums so I guess I am just venting.

@Harvey_Specter, this seems to have fixed the issue this time. Been off charger for 5 hours and at 76% which is still a bit higher on the battery drain but not as drastic. Thanks!