This 364 Silver Oxide Button Cell Battery is 1.55 V and has a capacity of 21 mAh.
This battery is a replacement for Eveready 364; Vinnic: S621; Renata 31; Duracell D364; Varta V364; RayoVac 364; Maxell/Toshiba SR621SW, SR621W; IEC SR60; Other # SG1, GP64, AG1
These are replacement watch batteries and replacement small electronics batteries.