Hi I am really happy with my Tattu batteries. Perhaps ALTA intended for a different kind of battery, but when I want to mount the setup inverted, I can't mount my batteries in the tray without using duct tape ...! At the angle where it is supposed, the batteries are too short, and very hard to get into. On the other angle, the batteries sits tight between the foam rubber, but again the rubberstraps makes no sense. They can not really reach at any time. What do I or what batteries do you use?