Away from all theory I have already found several reports about using this caps successfully in just this application – battery spot welding. Recommendation was to use >=0,25F.

DIY spot welders often use high-powered components that can be a bit frightening, given the potential for dangerous malfunctions. [Wojciech “Adalbert” J.] designed his capacitive discharge ...

Mr Creative. Construct a Basic Spot Welder with Only a Battery at Home. Posted: April 26, 2025 | Last updated: April 26, 2025. Want to make your own spot welder at home?