So I was at the local Pep Boys getting a wireless remote light relay so I wouldn't have to run wires through the firewall (I'm lazy)
They had the Coleman Cold Heat soldering iron on sale for $12. Figured what the hell and picked it up. It works on 4AA batteries. Took it to work and soldered a few wires together and it does indeed work. It has a small light that lights up the area you are working on too.
I also have a butane powered Weller that works better, but is considerably more expensive. A regular plug in soldering iron is easier to work with as well.
But for the price, it may be good for the tool kit in the SMB in case you have to do some electrical repairs on the road. Probably good for working under the dash too...I hate having a regular soldering iron with the power cord while laying on the floorboard working under the dash. I always seem to knock it over in the worst possible moment.
I have had to do some electrical repairs on the road and had to resort to gum wrappers and tin foil as a temporary fix. Doh.