MD-MND8000 Manual Battery Pack Welding Machine The MD-MND8000 is a 8000A inverter spot welding machine built for high quality lithium battery pack assembly. It is suitable for large 21700 battery packs welding, such as Electro mobile, motorcycle and high capacity battery packs. The induction load voltage feedback mode keeps the welding voltage constant, so every spot is consistent and reliable. Key Features Constant voltage feedback control - induction load voltage feedback