Features: The welding process is based on the principle of high current and high temperature, melting part of the nickel sheet, and cooling. Adopt 5pcs MOS tubes, and the maximum current is up to 1700A; there are 5 MOS tube locations reserved on the back of the circuit board for DIY players to increase their own MOS tubes. output design, 99 gears of output power adjustable, more accurate welding, suitable for continuously welding thousands of points on nickel/nickel-plate sheet. With the digital tube real-time gear display function, 0-99 gears, 1-gear is the lowest, 99-gear is the highest, and the gears are gradually increasing. It supports 0.1-0.3mm nickel welding sheets with solid and beautiful welding spots. This product can be widely used on spots welding cylindrical lithium batteries and nickel metal hydride batteries such as 14650/17490/18650/21700/26650/32650 etc. Note: The switching power supplies, -sformers, chargers, water batteries, and rechargeable batteries are not allowed to be used as power supplies Specifications: Name: Spots Welding Machine Set Working voltage: 6.5-16V Working current: Less than 20ma Standby power consumption: Less than 0.5ma Recommended working temperature: -10 to 60 Voltage: 12.0V Welding current: 1700A Max Welding thickness: 0.1-0.3mm Capacity: 20AH-80AH (new battery not more than 45AH, more than 45AH consulting customer service for current limiting ) or: 4-5 strings of super- capacitors Material: Metal colour: Purple Package Contents: 1 set x Portable Spot Welder . Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.