Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Well...a day or so on and I can conclusively state that my watch battery drain issues are once again gone.
Slept wit the watch on (went to bed at 99% around 11pm) and when I got up at 6.10am it was at 96%. Not bad. Not bad at all.

It's now 10am and I'm still at 92%.
 
I’m not sure if this has been covered or you are aware, please don’t take this as an insult to your intelligence or I am teaching you to suck eggs.

For around 24-48 hours after a big install, your iPhone will index and this CAN result in decreased battery performance on both devices. I have experienced this and it sometimes happens but mostly when it’s quite a large install or a lot of things are added or taken away.

Hope this helps.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.