Print both Files on their Cosed Side Down
Joining Batterys and Module
Join all 5 batterys together in paralell, either by soldering or welding.
Then insert the module into the front part and keep it in place with hot glue.
Next step is to solder the battery wires onto the module with shortest cable thats possible for you(always check the polarity).
Then slide in the batterys into the Compartment and firmly press both parts together.
I had to use my vice due to bad printer tollerance.
Thats it ! - Charge and use it for whatever you need :)