I have a bit unusual questions...
I need something small that uses V-Mount batteries. It could be anything really: Led Panel, display etc.
The reason is that when you freight equipment you are allowed to have 1 battery inside and 2 spares. This means you can actually freight 3 batteries with the rules UN3481 instead of dangerous goods.

This is how they handle most tools like drills etc.
I just did a shipment with Gimbal, Drone and another case with Teradek Cine 7. This meant I could ship in total 9 batteries. Only problem is I ran out of things to attach Vmount too. I have some large LED pannels that I guess would work but they are 4kg each.