diy smart portable spot welding machine set with battery for 18650 battery group nickel sheet spot welding

special reminder if the soldering pen is pressed too lightly, sparks will be generated and the nib will be burned to insulate. at this time, the welding effect will be greatly reduced, and the welding will not be possible. this is a high-quality spot welder that is transported by itself together with the load management control module. automatic trigger point welding, 5 adjustable gears, easy to adjust according to your welding needs. when the automatic storage gear is turned off, it will usual