Here is a pix of the hatch for the battery box..
The rear has hardwood pins into the rear wall of box and the
front is attached by buttonhead screws going into hardwood
blocks.. This is in case of a possible hard landing..
There is a hole in the front wall of the box at the top for the
power wire to exit.. This location was chosen so to be sure
the wire does not interfer with the aileron linkage..
Helps to plan ahead..