im only going to tell you how to get the motor out and make it run on a battery pack
Mats:
1 12-18V rechargeable battery
1 on/off switch
1 Portable air compressor, the kind ya plug into a car
Female/male wire connectors
Ok lets get started
first off pull the compressor apart to get to the motor and pump, most are different, you want to make sure the motor and pump are screwed together, if not put it back together and return it to the store, pick out a different one
now get the pump out
cut the plug off
run some extra wire from your battery pack to where the plug was
you want to pick a convenient spot for your switch, wire it in
in the end it should end up like the setup in my video here
now all you have to do is attach it to your Launcher