Ok, I got some nano sim's this weekend and ran dual sim's and wifi the whole weekend. There was an ota update also to be done. By sunday evening I still had 45% battery left. Not bad for the weekend. I expect this week to chew the battery as coms vary around the farm. But I expect every second day charging.
Device is fast, screen can be read well in bright sunshine, and I even got my ram used up to 3Gb. That's only half way!!! Not much of a phone camera guy, but pics are good enough for IM. I can hear the phone ring while riding the motorbike. Calls are clear (when not riding). Callers can hear me perfectly.