(Use science for peace please!) I did really need a spot welder though, and there was no shortage of examples of people who had built their own from supercapacitors, typically in the 500 F range.

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For battery assembly, a spot welding tool is nice to have. I develop this portable version, using a super capacitor and recharged with standard 18650 battery It is long time I was thinking to do a ...

The spot welder [Erwin] used is the work of a user by the name of [aulakiria] (link is Korean, machine translation here) and is designed to be portable and powered by batteries commonly used for RC.

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