Feature: 1. VOLTAGE AND CURRENT: Users need to supply 12V battery power with the welding current ranging from 90A to 150A to use this welder pen. Common 0.1mm to 0.12mm nickel plated plates are easy to weld 2. WELDABLE MODEL: The circuit board of the spot welder can be used for welding 18650, 26650, 32650 lithium battery, portable, stable, reliable and durable 3. BATTERY POWERED: If you have a car starter battery, or a high power battery pack, you can connect and use welder pen, saving production costs 4. RECOMMENDED BATTERY MODEL: A battery with a large discharge current directly affects the welding effect. The following batteries are recommended for spot welder pen, 20-45ah acid batteries with good performance and small internal resistance(internal resistance less than 10 milliohm, discharge current greater than 90A), such as new automotive starter batteries; 3.5-5.5ah 45C 3S model aircraft lithium battery pack; 30-35ah 18650 battery string 5. WITH FITTINGS: Spot welder pen equipped with nuts, screws, capacitors, connecting wires, etc., complete accessories guarantees convenient operation Specification: Item Type: Spot Welder Pen Product Material: PCB, copper, nickel Use: 18650 26650 32650 lithium battery welding, portable, stable and reliable System Voltage: 12V-14.6V Working Current: 90-150A(not work when discharge below 90A) Recommended Working Battery: 20-45ah acid battery, good performance, small internal resistance 3.5-5.5ah 45C 3S aviation model lithium battery pack 30-35ah 18650 battery string. Package List: 1 x Control Board2 x Heat Shrink Tube4 x Nut4 x Screw1 x Nickel Strip2 x Capacitance2 x Connecting Wire2 x Spot Welding Pen Note: Please ensure that the current of the battery is greater than 90A, otherwise the welding will not be possible