Features Spot welding adopts the principle of rapid local heating and large current cooling. Sufficient current supply is required, generally the welding current of plating plate of 0.1‑0.15 is about 90‑150A. It is recommended to use the following batteries: 12V starting power for automobile and 3S high‑power battery pack for model airplane. Three high‑power lithium battery packs, 40900 3‑pin battery packs, batteries with good performance above 12V 20A. Capacity x discharge rate = load capacity. Take 5200mA air battery as an example, the discharge rate is 35C. Specification:Condition: 100% Brand New Item Type: Spot Welders Pen Material: Plastic, Brass Model: No Usage: 18650/26650/32650 battery can be welded, portable, stable and reliable System Voltage: 12V-14.6V Operating Current: 90-150A Recommended Battery: -20-45AH battery with good performance and small internal resistance -3.5-5.5AH 45C 3S aviation model lithium battery pack -30-35AH capacity 18650 battery pack Package List:1 x Control Board 2 x Heat Shrinkable Tube 4 x Nut 4 x Screw1 x Iron Sheet 2 x Capacitance 2 x Cable2 x Spot Welding Pen  Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 1 x Control Board 2 x Heat Shrinkable Tube 4 x Nut 4 x Screw 1 x Iron Sheet 2 x Capacitance 2 x Cable 2 x Spot Welding Pen