This product is very useful in daily life, with an battery, it will become an energy storage spot welding machine for welding nickel pieces such as lithium batteries and nickel-chromium batteries practical, easy to operate and use, wide application range, has a long service life. Come on and try it. Specifications: Material: PCB Suitable for: 18650/26650/32650 lipo battery System voltage: 12-V-14.6V Working current: 90-150A Suggested battery: (not included) 20-45ah Lead-acid battery with fine performance and small internal resistance 3.5-5.5ah 45C 3S aeromodel lithium battery pack 30-35ah capacity 18650 battery pack Package size: 190 * 110 * 30mm / 7.5 * 4.3 * 1.2in Package weight: 110g / 3.9ounce Note: If the battery is pretty and the internal resistance is very low, and then there may be large current overload. If you are not sure about your battery, it's better to extend the wire by around 1 meter with 2.5 or 4 wire, then it will reduce the risk of power tube burnt. Packing list: 1 * Main Circuit Board 2 * Input Wire 2 * Output Wire(with Welding Pen) 1 * Welding-Components Kit