On the ATT LTE version of 4.0.0.2 for about a week now. No noticeable difference in battery life so far. I get about 2 days, 18 hours before hitting 10%. Couple hours on teh charger and good to go for another (almost) 3 days.
I am also having the same issues. Battery drain working out about 1% every 7minutes (11 hour life time) however when viewing the applications power use there is a mismatch suggesting that something in the system is pulling the power. Before the update the watch would last about 2 days constant use.
I didn't have any issues with 3.0.0.0 or 3.0.0.2 like others.
I am about to do a factory reset but do not hold out much hope.
There are masked videos running in the background of legitimate banner ads on "Cheetah" apps. My battery was losing 80% of its charge overnight. I read this article, uninstalled CCleaner (the only one I had on the list) and two other battery apps and my percentage was 91% this morning. https://www.xda-developers.com/cheet...-android-apps/
I'm having the issue on my S3 frontier as well. I get 4 to 6 hours tops since the update. Just performed a factory reset about 2 hrs ago so we'll see how tomorrow goes.