I don't think we can completely blame it on jellybean. I haven't gone through a normal day since the update, and I can't really count the day when I got the update because I asked Google Now every question I could think off and kept playing with the homescreens admiring project butter in action. My phone did get a bit warm once or twice when it really wasn't supposed to be doing anything, but then again, I hadn't restarted it yet since the update was installed. The Note 2 seems to have great battery life with jellybean. Granted, it has a huge battery, but it also has a huge screen and all of that S pen functionality to feed, along with the quadcore processor. So, I don't think the poor battery life that some of us are experiencing is due to just Jellybean.