I have had the P3P for well over a year now and all the batteries fitted in nice and tight with no movement at all. When setting up the P4P I noticed didn't sit flush with the body when fully pressed in to the body. Also I can move the battery up and down when in place. Doesn't seem right to me but as I have no experience with the P4 or P4P I thought I would ask you to see if it's normal for the P4 range. See image and video below.