Review on Portable DIY Mini Spot Welder - 4 Output Power, Household Nickel Belt Spot Welder with Aluminum Alloy Shell and 2Pcs Welding Pen - Ideal for 18650 Battery DIY Projects by Richard Cuneo

I was hoping it would make a 0.15mm thick strip but its performance isn't up to the mark. Welds a little, but it turns out a poor-quality seam. To be fair the description says it's 0.12mm so I was asking for a lot. But another user review showed that 0.2mm welded well at high power. The internal circuit board differs from the pictures. The physical layout is the same but the colors are different. Why does it matter? Well, confidence goes down when some things differ from what is pictured or described. What else has changed that makes my purchase no longer relevant? Have the batteries been replaced with cheaper ones? What about powerful electronics?