General description This K99 Spot Welder DIY Kit is designed for power adjustable mini spot welding, suitable for various cylindrical lithium batteries including 14650, 17490, 18650, 21700, 26650, and 32650. It effectively supports spot welding of 0.1-0.3mm nickel sheets, ensuring a firm connection. Technical specifications Power adjustable Spot welding thickness: 0.1-0.3mm Compatible battery types: 14650, 17490, 18650, 21700, 26650, 32650 Material: PCB Measurement error: +/- 1-3cm Package Contents 1 x Control board