Okay, I have to say right from the start I have no idea WHY this is the case, but the deal is that I was on Imilka CM9 after moving over from the stock GB (LC1) ROM, and I had really really bad battery performance. I couldn't finish a full wakiing day from morning 'til going to bed without having to recharge in the evening. Everyone says the CM9 S2 port to Note is great for battery, but not for me.
Right, here's the weird part: Cyanofree lasts a couple hours longer on battery. No where near as long as the GB ROM, but better than Imilka.
Like I said, I don't know why. And I hope that it gets MUCH better after official ICS is released. But for now, I am thankfull I go an entire day on one charge and still be able to enjoy CM9.
So, thanks Cyanofree.
PS. I can tell you why battery usage is so bad: awake times are higher than screen times. And I can tell you it is the "TimeService" that is awake. I don't know what that is, where it is, or what to do about it (I find no direct reference to it here on the XDA Note boards).
MB526 CM10 Nightly | GT-N7000 CM10 Nightly