I need to join ten, sub-C ni-cads in two rows of five for my spectrum analyzer. They were furnished to me without tabs.. I just tried soldering strips of heavy copper foil that I had bought from an art supply store long ago to them, but the heat sinking of the sub-C cells was really too much for my 180 watt soldering gun. It looks like my choices are torch or arc weld. I have a 70 amp arc welder, but if I use that, I probably don't want to use the copper foil I have for the tabs because it will probably get obliterated by the arcing. I guess the tabs the industry uses are tin plated, something-or-other. What do any of you recommend for attaching tabs to these cells, and using what attachment technique? The battery compartment has enough space to accommodate large diameter, solid copper wire if need be.