In this project I am making a DIY spot welding machine to be used for building battery packs with 18650 lithium ion cells. I also have a professional spot welder, model Sunkko 737G which is around $100 but I can happily say that my DIY spot welder out-performs the professional spot welder by outputting higher currents and being able to solder pure nickel strips to the batteries. There were a few obstacles in the process and a few things I’ve learned so I hope this tutorial will guide you if you decide to build one yourself.”

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