The welding process is based on the principle of high current and high temperature, rapidly melting part of the nickel sheet, and cooling, can fully meet the requirements of small spots welding machine, stable quality, solid welding and no tube frying. This spots welding machine has high power and 11 gears adjustable for more accurate welding, suitable for continuously welding thousands of points on nickel/nickel-plate sheet. Features: Working Principle: The welding process is based on the principle of high current and high temperature, rapidly melting part of the nickel sheet, and cooling, which can fully meet the requirements of small spots welding machine, stable quality, solid welding, and no tube frying. Reliable Quality: It is a lightweight, portable, and ergonomic machine design, providing a comfortable grip and long-lasting comfort, and long-lasting without fatigue. Handheld spots welding machine, single hand can operate it, truly free hands, more convenient to use. Dual Pulse Welding: Professional dual pulse strong output, with 0.8mm reasonable welding needle spacing, ensures the effectiveness of spots welding, no need to spend time manually adjusting the spacing, saving time and effort. 11 Gears Adjustment: 11 gears of power adjustable program, the welding process is more accurate and the welding effect is more perfect. With gear indicator light function. Support manual and automatic dual modes design, manual mode for more precise power adjustment, and automatic mode for more convenient to use, more accurate, and more professional. High Safety: Built-in quality and safety chip and temperature control sensor, and using safety algorithm, the dual safety protections of software and hardware ensures your use. With impact protecting, short circuit protecting, low temperature protecting, high temperature protecting, overcharge protecting, and over-discharge protecting functions. 1800mAh Lithium Battery: Built-in 1800mAh large capacity high rate battery, with low power consumption and thousand solder joints long endurance. No need to recharge the spots welding machine frequently during daily use, ensuring safety and durability without battery loss. Wide Applications: It can easily handle multiple scenarios, suitable for the welding process of cylindrical batteries, spots welding of mobilephone batteries, button battery spots welding, and manual DIY. Specifications: Name: Spots Welding Machine Material: plastics + metal Battery: 1 * built-in 1800mAh lithium battery (included) Input voltage: 5V, 1A Output voltage: 4.2V Max Output current: 650A Max Input interface: Type-C Working temperature: -10 to 60 Item size: 43 * 25 * 192mm / 1.69 * 0.98 * 7.56in Item weight: 100g / 3.53ounce Package size: 81 * 210 * 31mm / 3.19 * 8.27 * 1.22in Package weight: 300g / 10.58ounce Packing List: 1 * Spots Welding Machine 1 * Roll of Nickel Sheet 1 * Type-C Cable 1 * Guideline