Features: *Four ultra-large current tubes, the power far exceeds any portable spot welder on the market. *Two professionally designed low internal resistance strings, 2.7V 3000F capacitors *16 square welding wire, thickened pure copper welding pen, with alumina copper spot welding needle, spot welding non-stick needle *Excellent power and welding ability, easy to weld 0.2 pure nickel, 0.3 nickel plated, 0.4 stainless steel (mm unit), the solder joints are bright and not black. *This spot welding machine is suitable for cylindrical monomer, mobile phone soft battery, electric vehicle battery assembly, power tool battery maintenance, etc. *Automatic welding can be adjusted in 0.5-7 seconds, and the welding power can be adjusted in 1-120 steps. *The board comes with constant current and constant voltage charging and capacitor equalization functions. *LED digital display numerical control module, the capacitance voltage display is clear at a shine. *Portable handle design, the compact welding machine can be moved at will. *Detachable and replaceable welding pens, other welding pens can be replaced later. Warning: 1. Two 2.7V300F are connected in series with 5.4V1500F. DIY requires certain electrical safety knowledge and basic practical skills, and the maximum voltage does not exceed 5.4V. 3. It is strictly forbidden to adjust the voltage by yourself! There is no short circuit or direct discharge of the soldering pen! No need to disassemble, solder or change wiring. Do not touch the board with your hands after plugging in the power, so as not to damage the CPU chip Note: 1. It takes 20 minutes to charge for the first use, and then spot welding can be done. Charge the voltage above 5V before proceeding. 2. Please start the test from the first gear before use, and gradually add it after use. Not enough, start the test step by step from the small gear to the big gear. 3. The correct operation is to press the pen tip on the nickel piece. Some force when spot welding. 4.Do not spot welding after unplugging the power plug, it will damage the machine 5. Please turn off the main switch when not in use, the capacitor does not need to be discharged, just store it in a dry environment 6. It needs to be plugged in and cannot be used after it is powered on. cut 7. Non-professionals do not disassemble the machine 8. Please use power supply and accessories that meet safety standards. It is recommended to use original accessories. 9. Please make sure that the two soldering pens do not touch the power of the machine before starting the machine. 10 Turn off the machine after use and store it out of the reach of children. 11 When using for the first time, "Power" is set to 5ms by default during spot welding. According to the exchange Visually observe the welding effect, and gradually set the appropriate pulse time to obtain a good welding effect Specification: Name: Portable spot welding machine Shell material: ABS Display: LED digital display Input power supply voltage: DC12V 4A Capacitor: Single 2.7V 3000F Welding thickness: 0.2 pure nickel, 0.3 nickel plating, 0.4 stainless steel (unit mm) Operating temperature range: 0~+75 Soldering pen: Removable soldering pen Size: 230*140*71mm Colour: Black Packages included: 1.Portable spot welding machine 4 soldering pins 1Nickel Tape File knife 2 soldering pen 1.Power Supply