A lithium coin cell like the CR2032 battery or CR2025 is a small, coin-shaped battery that is based on lithium manganese dioxide chemistry. The industry standard (IEC) sizes for some common household lithium coin batteries are: CR2032: 20 mm diameter, 3.2 mm height CR2025: 20 mm diameter, 2.5 mm height CR2016: 20 mm diameter, 1.6 mm height