The spot welder is pretty easy and straight forward to set up. I got the parts (prebuilt kit + diode set) , bought some car battery clamps and set the whole thing up with a used 45Ah car battery that still had some life in it. The setup was pretty much exactly like in the video. I got the thing working right off the bat, but the welds were pretty crappy at first. I'm assuming that was because of the car battery being used and worn down. Nontheless I downloaded the Arduino code and just adjusted the welding time in one of the first lines to a higher number.
Now the welds work great, look great and do exactly wha they're supposed to do. The soldering points and general quality of the prebuilt PCB look great as well. I wish I would've invested in one of these way earlier, instead of wasting money trying to build a spot welder with a super capacitor that essentially cost the same.
5 star review and a recommendation for anyone who's looking to build their own battery packs with this thing.
Good quality PCB and low cost shiping fee, overall very satisfied with this seler I will carefully follow all his DIY projects couse of very detailed and exact description and good explanation. And yes I will recommend to everyone to buy this PCB.