I disagree with the claims on battery, the battery performance will be dependent on the screen brightness and the network radio. I had the GN2 and the battery performance was good for such device, however I set the display above 70% and not on auto my battery would really started falling around mid afternoon. Since day one I always had extra batteries. When I traveled I usually kept my screen on auto and I could be a whole day without worrying. The OGP behaves in a similar manner I have not seen anything that I would consider different on battery performance between devices
One thing I have noticed people complaining about battery is that they do all of the steps with screen display in auto and other things and they complain about battery performance, however they also complained about working in places with network signal is not that great, that alone will strain the battery as the phone is always trying to lock on the signal and this is big power consumer