Energizer 637984 3V Lithium Coin Cell Made with an additional plastic layer to deter shrinkage and improve tamper resistance and child safety Energizer Batteries offer a comprehensive range of lithium coin cell batteries for a broad range of applications that required long service life over a wide range of operating temperatures. These batteries offer superior performance in terms of reliability and safety, and have an excellent storage life at room temperature. Size of battery - 20mm x 1.6mm Also known as - CR2016, BR2016, SB-T11, 280-202/4