The battery was invented by Professor Alexander Voda of Italy. One day, Professor Voda came to the library to consult relevant materials. Suddenly, he was attracted by a compilation of experimental reports of German scientists, which recorded an experiment made by scientist Sloza in 1750.

Sloza said in the experimental report: when two different metals are clamped in the upper and lower parts of the tongue, and then the two metal blocks are connected with a wire, the tongue will feel numb; If you clamp your tongue with two identical pieces of metal, you won't feel this way.

After reading this experimental report, Voda returned to the laboratory and quickly found a thin piece of tin foil and a new silver coin, and connected them with a wire. Sure enough, his tongue also felt numb.

"This is the feeling of electric shock," Voda said to his assistant. "There must be current in the wire." Voda believes that this phenomenon is probably caused by dilute acid in the mouth.

1799, Voda arranged several cups containing dilute acid together according to his own design, then put a zinc sheet and a copper sheet in each cup, and then connected the copper sheet in the previous cup with the zinc sheet in the latter cup with wires. Finally, connect the two ends with wires.

Walter pinched both ends of the wire with his fingers. His fingers were numb, and his body was numb, so the most primitive battery was produced.