Battery-powered welding machine is specially designed for repair welding on inaccessible sites without direct access to mains electricity, as well as being highly suitable for welding in electrically hazardous environments. When the battery powered welding machine works, the welding energy is drawn solely from the battery. A fully charged battery delivers sufficient power to weld up to 41 pieces of 3.25 mm diameter electrodes or 85 pieces of 2.5 mm diameter electrodes.