Feature: 1. Adjustable Uses: From 1 to 99, the mini spot welder supports 99 level adjustment to better satisfy your various needs and improve efficiency. 2. Smart Operation: The welding pen can withstand 500A high current, while the LED indicator and triggering button will simplify the operation. 3. Wide in Utility: Allows for broad utilization on different batteries such as 18650 battery, 21700 battery and more, reliable and practical. 4. Has High Safety: The whole welding process is very safe, both amateur and professional can use this welding with high safety and great ease. 5. Simple Carrying: Designed to have a compact size and a light weight as well, the Spot welding machine is very convenient to carry to outdoor. Specification: Item Type: Battery Spot Welder Tightening Method: Steel Wire Cold Pressing Voltage: 12V-16.8V Wire Specification: 12AWG 40cm / 15.75in (approx.) Welding Needle Specification: 3MM body, 1.5MM concentric needle. Instantaneous Overcurrent: 500A Wire Material: Tin Plated Brass Copper Wire Diameter: Approx. 3mm / 0.12in Insulation Thickness: Approx. 1.3mm / 0.05in Conductor Resistance: 6.3ohm·km Maximum Current: 100A. Package List: 1 x Battery Spot Welder1 x Nickel Piece Note: It is recommended to weld 0.1mm inside the nickel plated steel strip, and overlapping two welds can also achieve a 0.2mm effect. Cannot weld pure nickel or copper aluminum, etc.