Spot welding battery packs.
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Previously:
https://www.homemadetools.net/forum/...284#post211459
https://www.homemadetools.net/forum/...636#post193486
https://www.homemadetools.net/forum/...968#post191129
https://www.homemadetools.net/forum/...870#post171375
https://www.homemadetools.net/forum/...574#post170312
