Do you turn stuff off to get 3 days + 7 hours? I'm getting about the same (maybe bit better) than Note 2 battery life with my kind of usage. I have nothing turned off though and all sync accounts active.
Mine's not in full proper use mode just yet, main used it for web, YT, a bit of gaming etc. data turned of during the night. 3 SIM CARD inside, using it as a spare phone for the moment just testing it out.