i want to make battery tab spot welder how can i make?

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It involves solder.
It absolutely must NOT involve solder. It is very dangerous to solder batteries.

And it is safer to weld them?
Well then it involves a transformer.
it involves people not being stupid
orksecurity7 years ago
See answer(s) to your other copy of this question. (Posting twice does not produce more or better responses.)
to be fair, the other answer wasn't very fantastic :D