A part of the review has been auto-translated.
The spot welder works like a charm. Before using, make sure to solder the capacitor to the input of the device. I spot welded a 1.5 mm thick nickel strip with the LVL 3 power (Blue colour). For the best result use a big 4s lipo Battery. I used a 5000 mAh 60C lipo. You need at lease 150A discharge current for the device to work properly (You can calculate the max discharge current by multiplying the capacity with the C rating. For example, if the Lipo has 2000mAh and 100C the calculation should look like this: 2000mAh * 100C = 200A). The cables of the spot welder get a bit warm after a few spot welds on LVL 3 power output. The device should be able to spot weld more than 2.5 mm thick nickel strip with eas. How to use: - Connect the Battery (Obviously) - Press on the button to select your Mode/LVL (I used LVL 3 for a 1.5mm thick nickel strip. Test your welds on two nickel strips) - Press the two pins firmly on the nickel strip. NO GAP should be between the two things you want to spot weld. - When the led flashes up, the spot weld should be done. Congrats you made your first spot weld ;)
it works well, using 4S lipo battery. when using first and second level of power, device and battery do not get too much hot, so you could make many spot weldings.