Method 1: Use a welding machine to spot weld connections in the absence of batteries. Form a loop to spot weld the battery...
two
Method 2: Use electric soldering iron, wire, solder wire to connect the battery with the wire, which is suitable for the metal surface of the iron-copper battery.
three
Method 3: Use an inductor to connect the two ends to generate inductive current and supply power to the load.
four
Method 4: Connect the positive and negative terminals of the battery with screw wires