CR2032

A 3 volt lithium coin cell, most commonly used as the backup battery in real-time clock modules, computer motherboards and small remote controls. Its very low self-discharge means it holds charge for years, which is exactly what a clock backup needs — the RTC draws microamps, so one cell typically maintains the time for several years. Note it is not rechargeable, despite some RTC modules containing a charging circuit intended for a different cell type. Very low self-discharge holds charge for years; The standard RTC and motherboard backup cell; Stable 3V output throughout most of its life; Compact 20 mm coin format