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A CR 2032 battery is a button cell lithium battery rated at 3.0 volts. It is commonly used as a CMOS battery in computers, calculators, remote controls, scientific instruments, kitchen, office and personal scales, wireless doorbells, garage door remotes, watches and other small devices. Nominal diameter is 20mm, nominal height is 3.2mm. CR 2032 indicates a round cell 19.7-20mm diameter and 2.9-3.2mm height as defined by the IEC standard 60086.