This manual spot welder with optional 5000A, 8000A, 10000A transistor or DC inverter welding power supply is used for manually welding pure nickel or nickel-plated steel strips onto cylindrical lithium-ion battery packs in the process of assembling cylindrical battery packs, such as 18650, 21700 26650 32650 32700 and other cylindrical batteries, and this machine also can be customized according to the user's needs.