Just a great product
For DIY Arduino Battery Spot Welder V2 Prebuilt Kit
Does what is should do. After tweeking the settings, the spot welds are tight.
Maybe a feet switch should be included. I could buy it at a local electronic shop for cheap and the car battery was present.
A better instruction is necessary because without the youtube film you can connect it the wrong way. Once you know it, it's simple. A simple sketch would be enough.
