Review on 🔌 Portable Spot Welder Machine, Kerpu Mini Spot Welder with Energy Storage 5000mAh for DIY 18650 Battery, Spot Welding Equipment. Type-C Port 2A Input, Portable Battery Welder. by King Reeves

Everything I needed came. It loaded and made spot welds reliably. The depth of the welds is somewhat related to the internal battery charge level, so you'll need to set it low when the battery is fully charged and slowly crank it up as you go. You can just always plug it into the charger. I haven't tested this. The pack I put together was 32 recycled (and tested) pairs of 18650. The supplied strip is a bit flimsy, but I wasn't looking for high current so that was fine.