1The circuit board is automatically triggered and can work conveniently and quickly with no need to switch. 2The product is small in size and light in weight, which makes it portable, easy and convenient to carry. 3With professional design and reasonable structure, the spot welder circuit board is easy to use and operate. 4High quality material can make sure the durability and stability of the product. 5The power of the circuit board can be supplied by both lithium battery pack and Fafad capacitor bank. Item Type:SpotWelderCircuitBoard Material: PCB Model: GT-690 Power Supply Mode : Lithium Battery Pack Battery Capacity: 100A Working Voltage: 3~4.2V Charging Parameters: 4.5~7V, 3A How to Use: Connect the battery to the positive pole of the product and the negative pole of the battery to the negative pole of the product. Power supply mode : Farad Capacitor Bank Capacitor Voltage: 5.7V Recommended Capacitance: 3000F Working Voltage: 5.7V Recommended Voltage: 4.5~5.5V How to Use: Connect the power supply and the Farad capacitor in parallel, connect the positive pole of the capacitor to the positive pole of the product, and connect the negative pole of the capacitor to the negative pole of the product. 1 xSpotWelderCircuitBoard