On Rz67 ProII and A75S, I am still on the original battery I put on 4 months ago into new Rz body.
I shoot 3-4 days a week 500 images a day. I do not see any battery loss at all. My experience with Rz is one 6V battery every 6 months. My set up in LC11 in on RZ.
Could it be a phase one thing?
I have the adaptor Plate from Phase One 645 to RZ...
They say it is the plate...:+} That is supposedly consumes juice even when the Back is not on.
I will post how long they last to, but was warned my many that it goes through Batteries like there is no tomorrow..:+}
I have gone through 2 batteries just shooting to try the new Back.. But I think they were on the shelf to long...
I just put a new GP alkaline battery in and we'll see how long it last.
Not to mention the fact that it is a pain to have to take apart the RZ with grip and winder just to put a new battery in. Hope it does not happen during an important shoot...