I have had NO luck igniting copperheads with anything less than a 12v car battery. Using two 6v lantern batteries might work, but running them through 100 ft. of 18 ga. wire will definitely reduce their effectiveness. I had my first successful ignition of a copperhead last weekend with a 12v deep cycle battery and a Pratt Hobbies GO box. I'm in the process of upgrading my launch system too, and plan on using the Go box and a 14 ga. extension chord to get out to my 100 ft. launch pad for H and I motors. I launch a lot of C through G engines too, so a shorter extension chord for the 30 ft. launch pads are in my plans too. That way I can plug into whichever chord I'm using. This is all theory at this point, and I will be monitoring this thread for ideas.
NAR 92675 L-2 Superstition Spacemodeling Society
I may be getting older, but I refuse to grow up.