364/363 (SR621) Watch Batteries
These button-style watch batteries are normally used in basic wristwatches and other low current drain applications. The 364/363 cell provides average current capacity in a relatively small case. Other names for this style are 364, 363, AG1, SR621SW, SR60, RW320, D364, V364(531), 28034 and SB-AG.
These silver oxide batteries measure 6.8mm x 2.15mm. They supply 1.55V, with a typical nominal capacity of 20mAh.