The cr2016 is a 3v lithium coin cell from energizer it is 20mm in diameter 16mm thick weighs 18g and has a capacity range of 800m ah 900m ah reliable dependable power used in heart rate monitors keyless entry glucose monitors toys and games replaces 2016 280 202 280 204 280 206 br2016 cr2016 dl2016 ea50cf ecr2016 fa kl2016 lf14v sb t11