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 Michael Finnegan

Yes, this spot welder works, but with many caveats: 1. The list definitely doesn't make it clear, but the instructions provided do: This machine is ONLY intended for welding thin strips of metal on batteries. This is a separate special device, not a universal spot welding machine. For example, I thought I could use it to weld washers to nuts. I was very, very wrong. 2. Performance varies greatly depending on the type of metal to be welded and its combination (e.g. steel with nickel). To use this reliably, you need a college degree in metallurgy, source all your materials from a place that offers an accurate and reliable breakdown of the exact chemistry of the metal you're buying, and then run hundreds of tests to determine if it is the case is what metals and what combinations does this thing actually weld. (You would think the manufacturer would do this for you and include a handy reference sheet, but they are lazy and prefer to just flippantly claim that it works with steel and other metals, which is a half-truth at best.) 3. The performance of this device is highly dependent on the skill of the operator. There are many possible placement options for the electrodes. How you position them has a big impact on welding efficiency. Be prepared to invest a lot of time and unnecessary practice material to refine your technique. Pay attention to how current flows between the electrodes. I have found that the best results are obtained when the electrodes are placed so that the current flows through the metal and not just one side of it. The only thing I have ever successfully welded with this machine was the included nickel foil on steel and it took several attempts. Now let's pay a little more attention to the description that says that one of the two metals to be welded must not be thicker than 0.2 mm, this requirement is now much more noticeable than it seemed to me when I bought it. This requirement is no joke, and washers are thicker than 0.2mm. Aside from making battery packs, the only other use for this thing really is making really nice and strong tinfoil hats. except that this device will not work with aluminum. Yes. All in all, if you don't make a lot of battery packs, ditch this article and only spend about $150 on a real welder.