Feature: 1. Scope of Application: Mini spot welder can be suitable for welding cylindrical lithium batteries, nickel metal hydride batteries, cadmium and nickel batteries, or can also be used for iron, steel, stainless steel plates with a thickness of less than 0.2 mm/ 0.007 inches, etc. 2. Multifunction: Portable spot welder machine supports automatic working mode, low power charging reminder, real time temperature monitoring of circuit boards, high temperature reminders, screen display flip, and solder joint counts. 3. Durable Material: Spot welder uses aluminum alloy shells, fire resistance and fall, guarantee safety surfaces, anode oxidation technology, beautiful wear resistance. 4. Use Note: Try to avoid using while charging, which is easy to damage the battery. When the temperature of the welding pen is too high, please use it after cooling. The voltage is less than 7.3V. 5. Small Portable: Spot welding equipment structure design is compact, small in size, saving storage space, and convenient to carry and use. Specification: Item Type: Spot Welder Material: Aluminum Alloy Battery: Lithium Battery (Shipped with Built in Battery) Battery Model: 18650 Battery Capacity: 4000mAh Dowling Multiplied Rate: 40C Power: 5000W Point Welding Thickness: 0.1-0.15mm. Package List: 1 x Spot Welder1 x Charger1 x Roll of Aluminum Tape1 x Round Sand Paper1 x English User Manual Note: Delivery with built in battery.