A dry cell battery is a type of electrochemical battery that uses a paste electrolyte, as opposed to a liquid or gel electrolyte found in other types of batteries. The electrolyte in a dry cell battery is typically a paste-like mixture of ammonium chloride or zinc chloride, which is immobilized within the cell to prevent it from leaking.

The most common type of dry cell battery is the zinc-carbon battery, which consists of a zinc anode, a carbon cathode, and a paste electrolyte. When the battery is connected to a circuit, a chemical reaction occurs between the zinc anode, the electrolyte, and the carbon cathode, producing electrical energy.

Dry cell batteries are commonly used in a wide range of portable electronic devices, such as flashlights, remote controls, toys, and small appliances, due to their relatively low cost, portability, and ease of use. They are also known for their relatively stable voltage output and long shelf life compared to other types of batteries.

Dry cell batteries are non-rechargeable, meaning they cannot be recharged once they are depleted, and must be disposed of properly when they no longer hold a charge. However, rechargeable versions of dry cell batteries, such as nickel-metal hydride (NiMH) or lithium-ion batteries, are also available for applications where reusability is desired.