To easily pass the wires thorugh the adapter part, we'll need to unsolder the metal ring from the wires. Use a blade or flush cutters to remove the heat shrink to expose the soldered portion.
Use a helping third hand to hold the metal rings while you unsolder each from the wire. Set the metal rings aside so you don't loose them!
Go ahead and clean up any strings left over from retration. You may also need to widen the exit holes a bit so the wires can pass through, you can use tweezers or a screwdriver to help the wire fit through.
The mounting hole will be easier to screw through by widening them up a bit with tweezers or a screwdriver.
The negative and positive connections are reversed on Canon batteries, so take note of the arrangment if you are adapting a different battery.
The metal rings will need to be bent so they can make proper contact with the connection pins on the LED panel. Bend the metal rings 90 degrees at the base of the ring like in the picture.
Pull the wires all the way through the pin cutouts to make it easier to resoldering the rings back on to the wires.
Use the helping third hand to hold the bent ring while resoldering them back to each wire. Position the bent corners so they are pointing away from the center.
After the metal rings are resoldered, push the wires back into the port slots as seen in the picture
Push the two connections rings inside the part until the metal is held against wall.
Use the included screws that come with the battery holder to fasten the battery holder to the adapter. Alternatively, M3 screws can also be used. You may need to apply force to the screw while mounting.
Make sure not to fasten screws the screws all the way through the holes. You'll want the screws to be flush to the back of the adapter piece.
Remove any excess material around the screws after mounting so the 3D printed part lays flat agaisnt the back of the LED panel.