Capacitors are not batteries. The characteristics of capacitors are that they can release a strong current in an instant, and melt the metal instantly for welding in a few milliseconds.Capacitors are not batteries. Capacitors can be stored at zero voltage. Long-term use requires no maintenance, there is no memory effect and there is no problem with over-discharge. For example, they can be used normally even after 1 year of inactivity (properly stored) Superb high-current discharge capacity for long-term use as a practical tool, cost-effective Farad Capacitor spot welder The capacitor discharge spot welder is the TOP of the entry-level spot welders Unbeatable welding capacity and superb value for money Superb power as well as welding capacity, 0.3mm nickel plated, 0.2 pure nickel Professionally designed two strings of low internal resistance, 3000 Farad super capacitorsFour super high current tubes, far more power than any portable spot welder on the market Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on.Material: Metalcolour: As shownPackage Contents:1 x Welder1 x adapterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.