Can fit up to 5 batteries. Stack them by alternating the metal clips (left side/right side), or they won't lay flat.
Supports are needed due to the pegs + the sloped bottom.
I printed in the upright position so I wouldn't have support material throughout the body. That worked out alright, but the bottom support material was a bit difficult to get off, and wasn't the cleanest.
I did not put a hook on the pegs - a press fit worked for me. YMMV.
The author hasn't provided the model origin yet.