I don’t think any of us are proposing to use this for high precision manufacturing of battery packs. Welding on button tops, or building a multi cell battery pack is closer to the truth. Perhaps even rebuilding a cordless tool battery.
The instructable linked has a video that shows the build process. I shall attempt to link it here que’ed up to the place where he starts testing it.
Be forewarned, you may want to have your safety glasses on before clicking the link.