The device is capable of spot welding thin metals such as foils and battery tabs by sending a pair of high current pulses between the two electrodes whenever [Radu] presses the trigger button.

[Aaron Christophel] has a battery spot welder that costs a not unreasonable 30 euros and can also be used as a novelty power bank. He subjects it to a test and teardown in the video below the break.

In this DIY project, learn how to build a simple 1.5V battery welding machine at home. This easy-to-make tool is perfect for basic soldering and welding tasks. Using just a few materials ...

The Hobart Trek 180 is a portable MIG welding that operates off its self-contained battery or 115V power and welds 24-gauge up to 1/4-in. mild steel in a single pass and recharges off an ...