Battery Charger as Power Supply

If you are DARN careful, and I do NOT recommend this without thought and having some confindence in your knowledge, a continuously variable MIG can work as a power supply Turn the wire feed all the way down, turn the gas off, and loosen the wire drive so it won't creep. "Clip" into the power terminals feeding the gun and double check with your meter as to voltage and polarity. Monitor voltage and carefully adjust. Some cheaper migs may not "start" until above 12V so "caveat!!