Yuneec Q500 Parts Storage Box, Battery Sized.
I have an after-market case for my Q500 which has slots for all the accessories, but nothing for the extra little stuff like filters, SD cards, etc. I have extra battery slots, but they are too deep to fish little things out of. I decided to make a battery shaped box to hold all those extra parts.
Infill level probably doesn't matter since the walls aren't thick enough to use much. I printed it fairly solid knowing I was going to be stuffing it in and out of a tight foam slot. I used clear packing tape for a hinge, so I wouldn't lose the top, but you don't have to. It fits tightly when closed.
To give fair credit, I took the idea of a battery shaped case from a video Adam Savage (YouTube "Tested" Channel) did on his new DJI Inspire years ago.