CR1220 3V Coin Cell Battery with wire with 2 pin Connector (CMOS) (Pack of 2) The CR1220 3v Lithium Battery with 2pin Connector is a button cell battery that is commonly used in watches, calculators, and other small electronics. The battery can provide power for up to 10 years and is an environmentally friendly battery that does not need to be disposed of in a hazardous waste landfill. This battery can be used in place of a coin cell battery and is easy to install. This CR1220 3v cmos Lithium Battery is a replacement battery for electronics such as cameras, watches, toys, and calculators.