I have had this on my leaked OS on my Berry for a good day and a half now, and haven't charged it in 24 hours and used it very moderately and battery life is the best I seen I am still sitting at 70 percent.

Full EDGE (2G) apps running have been facebook, BBm, email, test, msn, IM+ lite and browsing, and a few 10-15 minute calls

overall I have noticed a really good improvement through this OS and am very impressed with it, Best leaked OS release yet for the 6.0 on the 9700