Volta's original battery, known as the voltaic pile, consisted of alternating discs of copper and zinc, separated by layers of cloth or cardboard soaked in saltwater. Each pair of copper and zinc discs formed a single cell, which produced a small amount of electricity.

By connecting multiple cells together in series, Volta was able to increase the total voltage of the battery and therefore produce a greater current. The higher the voltage, the more current can flow through a circuit.

Volta's invention of the battery was a major breakthrough in the history of electricity, and it led to the development of many new electrical devices and technologies.