I've been trying to shove this down everyone's throat for a while. The Ready Welder is a battery powered welder, using between 12 and 36 volts to weld. This allows you to trail weld.
The forum http://www.readywelder.com/forum.htm is giving away 3 ready welders when they get 100 members with 5 useful posts or more. The forum was down for a while, but it is back up again.
Here's what to do...
go to the site, sign up, ask some questions, comment on a few of the answers, enjoy your free welder.