Our welding supplier was telling us about some cordless welders that ran on battery packs miller and another brand(I don't remember) he said good things about them. But I have not seen or heard anything about the handheld you talk about never seen one till I just googled it. I will say welders have come a long ways you can do a really nice job with some cheap welders these days it doesn't have to cost 5k+. I heard lots a good things about cheap harbor freight and amazon welders