How many basic types of mercury cells are currently manufactured?

Mercury cells, also known as mercury batteries, are categorized based on their construction and intended application. Currently, there are three basic types of mercury cells that are manufactured: the button cell, which is small and commonly used in watches and hearing aids; the cylindrical cell, used in various portable electronic devices; and the larger rectangular or prismatic cells, which can be employed in specialized applications that require stable voltage and extended shelf life.

Each type serves different purposes and is designed to meet specific voltage and capacity requirements, which is why recognizing that there are three distinct types is critical. Understanding these categories helps in selecting the appropriate battery for various electronic devices, especially since different devices have unique power needs and constraints.