This is a box to hold 2 x 3000 mAh 7.2V battery packs.
See- http://www.tenergy.com, Item #11204-01
Similar battery packs from other manufacturers are probably the same size, but you can tweak the dimensions of this one with the customizer to get an exact fit.
battery_holder.scad | 3.8KB | |
battery_holder.stl | 181.8KB |