After trying a couple of different battery spot welders, I was disappointed.
Between $100 and $200, the stuff that’s out there is limited. The quality isn’t great, they aren’t particularly durable, and even the reach is not adequate. By reach I mean how big of a battery you can work with.
So I decided to make my own.
Parts list:
12v lawn and garden battery $24.87
6x 4 gauge battery cables $15.96
high capacity relay $25.53
momentary switch $6.50
plywood $5?
copper nails $13.99
electrical tape $2?
Misc electrical connectors $1?
small gauge wire $5?
Total = $99.85