r/redneckengineering • u/gaccha_antiquechair • 3h ago
Battery spot welder from reclaimed power tool cells
Had one of those temu spot "welders", utterly useless stock il-po pouch cell cant deliver enough current to make an acceptable weld. Had several reclaimed high current rated 18650s from recycling power tool batteries, not internally shorted but with greatly diminished capacity so effectively useless.
Wanted to use a spot welder for building a pack with food cells, so decided to parallel up my junk cells to make a nice fire hasard / high current pack and use the control logic and drive section from the temu welder.
Results speak for themselves, not sure if crappy welder or just crap at welding.
Yes mom, asbestos underpants and full face shield were worn throughout.

