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xiali
Reviewed in the United States on March 16, 2025
I own multiple battery-powered spot welders, but this Dual Farad Battery Spot Welder is by far the most efficient, safe, and high-quality one I've used. It feels like a professional-grade tool with excellent build quality.The package includes the spot welder, two welding pens, a foot pedal switch, a power adapter, nickel strip samples, and a user manual. The compact black body, combined with a 1.8-inch LCD display, gives it a sleek, high-tech look. The 3000F dual farad capacitor is the real star here, supporting 25 adjustable power levels for 0.1-0.3mm nickel strip welding. The foot pedal and auto-mode options immediately caught my attention.I tested it on an 18650 battery pack. Once powered on, the LCD screen displayed the default settings, including power level (1) and capacitor voltage. Adjusting the power with the dial was smooth，I set it to level 8 for 0.2mm nickel strips and tried auto mode. Placing the welding pens on the strip and applying slight pressure, the machine instantly detected contact and fired a precise pulse, creating strong, clean welds that wouldn’t budge. No burn-through, no weak joints，just solid, reliable results.Switching to foot pedal mode, I connected the pedal and controlled the welds manually. This method is ideal for continuous welding, and I completed 20 welds in a row effortlessly. The 25-level adjustment allowed me to fine-tune the power for different materials:Level 5 worked perfectly for 0.15mm pure nickel stripsLevel 15 handled 0.3mm strips with no issuesThe LCD display clearly showed real-time settings and capacitor voltage, making adjustments quick and precise.I’m really impressed with the welding pens，they have thick, high-quality wires that handle high currents with ease. The pure copper tips are sturdy and smooth, ensuring consistent performance. Even after dozens of welds, there was only minimal wear, and the rubber grip prevented overheating.Despite its powerful performance, this spot welder is lightweight and easy to carry, making it convenient for various work locations. The dual-mode operation is well thought out，auto mode is great for quick jobs, while foot pedal mode offers more precision and control.After about an hour of continuous use, the power adapter gets noticeably warm. While not a dealbreaker, it’s something to keep an eye on.
Bob
Reviewed in the United States on March 13, 2025
This thing is awesome! Great powerful nickel strip battery connector spot welder.Instructions are a bit lacking, but it can be figured out. Reach out to the manufacturer and they will answer any of your questions because that’s about what I will be doing. They have previously answered several of my pre-purchase questions.
Yoav Liberman
Reviewed in the United States on April 2, 2025
This spot welder really impressed me. I had never used one before, and I ordered it not specifically for battery work but for connecting thin metal strips in model building and small mechanical toy projects. I tested it on the steel-plated strips included in the kit, and it worked very well. (I’m not sure why people refer to these as nickel strips—they're clearly steel with a nickel coating.)The only issue I found was with one of the terminals. The collet shaft at the end of one of the copper tubes wasn’t crimped properly and slid out when I tightened the copper needle. This should have been caught in quality control, but overall, the tool performs as expected.
Jason K.
Reviewed in the United States on April 2, 2025
I've been using a battery tab welder that I cobbled together from an off-the-shelf board and a LiFePO4 race car battery (RIP my race car). It worked "well enough" but I wanted to see what a properly engineered, pre-packaged solution was like.Okay, so, this is much better than my cobbled-together solution. It's really hard to explain the difference, except to say that this welder is just easier to get a good weld. Using my 14v battery solution, I sometimes get what I describe as an "arc blowout", where electricity arcs an air gap instead of passing entirely through the electrodes and nickel strips. This is likely partly due to settings needing to be tuned.However, with this product, it just worked perfectly out of the box. I used the included 0.1mm strips, as well as the 0.2mm strip I had on my bench and it's really hard to get a bad weld (within reason, of course). The neoprene(?) foam insulation for the electrodes is super nice as repeated welds cause them to get uncomfortably hot (the same happens to my home-brewed solution).Because I can't leave any warranty intact, I went ahead and pulled it apart to have a look inside. The case houses a pair of large capacitors connected to the front panel and controller board with nice big conductors. There's also a power management board that looks well-assembled (though I'm not an electronics engineer so I can't say if it's well-designed).I have a DC clamp ammeter but the sampling rate isn't high enough to get reliable results. After numerous attempts, the max current I saw at the highest setting was 270A.
J.B.
Reviewed in the United States on April 1, 2025
The spot welder works very well. Both the auto and the foot pedal modes work flawlessly. I would recommend the auto mode for any one off welds, and the foot pedal switch for welding up a whole battery pack, or in any case where there are several welds in a row.The spot wheeler is very easy to use, though I wish I could figure out how to make it instantly lock in my selection instead of having to wait several seconds for it to lock in on its own, as you can’t weld with the changed settings until after it is done.Other than my one little gripe, this is a great little spot welder that doesn’t take up unnecessary room. It has plenty of power to well just about any thickness of nickel strip that I’ve thrown in it. It’s definitely recommended for anyone who regularly does any battery pack making or plans on it.
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