[s5300]

I inferred that he was simply saying the fact of using chained car batteries for welding is hardcore, which I obviously think is not as I've seen it done by many people in many places.

As for the situation in this context though - sure, that could be said to be hardcore.

[pengaru]

You're right, car batteries are a very accessible source of high-current DC power. It's especially common for budget DIY spot welding.