[Cooper]

In the first couple picks you can see the slots it slides into. It's a bit of struggle to get it in but once together with the front sides on its very secure. And it actually opens up a lot of room. I have enough room to stack two of those batteries for some longer run times. And I don't think I'll have to secure batteries as they fit snug without being able to move much. I use to having to go to great efforts to have everything secured. I think this is going to stay right side up all the time.