CR1620 description The CR1620 coin cell battery, chemically known as a lithium manganese dioxide button cell battery, commonly referred to as a button cell, button battery, or coin cell, belongs to the CR series. It is widely used in various electronic devices such as digital watches, game consoles, computers, remote controls, electronic clocks, hearing aids, remote sensing devices, radio navigation beacons, sonar systems, search and rescue equipment, and more.