The electrons flowing from the anode to the cathode create an electric current, which can power small devices.

A Corex battery consists of a zinc anode (negative terminal), a carbon cathode (positive terminal), and a paste-like electrolyte made of ammonium chloride and zinc chloride. The zinc anode is typically in the form of a cylindrical can, while the carbon cathode is a rod that runs through the center of the can. The electrolyte paste fills the space between the anode and cathode.

The Corex battery played an important role in the development of portable power sources, enabling the widespread use of devices such as flashlights and radios. While it has largely been replaced by more modern battery technologies, the Corex battery remains an interesting footnote in the history of battery development.

The Corex battery was first introduced in the early 20th century by the American battery company, Ever Ready Battery Company (now part of Energizer Holdings). The name "Corex" refers to the battery's unique design, which features a central carbon rod surrounded by a zinc anode and a paste-like electrolyte.

Zn (anode) → Zn²⁺ + 2e⁻ 2NH₄⁺ (electrolyte) + 2e⁻ → 2NH₃ + H₂

The Corex battery works on the principle of a galvanic cell, where a chemical reaction between the anode and cathode generates an electric current. When a device is connected to the battery, the zinc anode oxidizes, releasing electrons that flow through the device and back to the carbon cathode. The reaction is as follows:

The Corex battery, also known as the Corex cell or zinc-carbon battery, is a type of dry cell battery that was widely used in the past for portable devices such as flashlights, radios, and toys. Although its popularity has waned with the advent of more modern battery technologies, the Corex battery remains an important milestone in the development of portable power sources.