Spot welding batteries.
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Previously:
https://www.homemadetools.net/forum/...787#post223615
https://www.homemadetools.net/forum/...090#post224654
https://www.homemadetools.net/forum/...164#post176557
https://www.homemadetools.net/forum/...708#post223389
https://www.homemadetools.net/forum/...737#post216601
