The SUNKKO 737G Spot Welding Machine is a high-precision, reliable device designed for battery pack assembly, nickel strip welding, and DIY battery projects. Known for its stable performance and durable construction, it ensures strong, consistent welds on lithium-ion cells such as 18650, 21700, and 32700. Its adjustable welding current, digital controls, and compact design make it suitable for both professional workshops and hobbyist use.