General description The K99 Mini Automatic Spot Welder DIY Kit features a 99 gear power adjustment system, allowing users to select from 0 to 99 gears for precise control. The digital tube displays the current gear in real-time, ensuring accurate adjustments during use. This kit is designed for efficient spot welding of various cylindrical lithium batteries and nickel-hydrogen batteries, supporting nickel sheet thicknesses of 0.1-0.3mm. Technical specifications Working voltage: 6.5V-16V Working current: Less than 20mA Standby power consumption: Less than 0.5mA Recommended use temperature: -10-60℃ Welding current: 1700A MAX Thickness of welded nickel sheet: 0.1-0.3mm Product size: 90x60mm Material: PCB + Metal Capacity: 20AH-80AH (new battery no more than 45AH or 4-5 strings of super capacitors) Compatibility and accessories Compatible with 14650, 17490, 18650, 21700, 26650, 32650 cylindrical lithium batteries Includes: 1 x Control panel, 2 x input line, 2 x spot welding pen, 2 x heat