394/380 (SR936S) Watch Batteries
These silver oxide, button cell watch batteries will replace both 394 and 380 batteries and use technology that’s suitable for either high or low drain applications. They will also directly replace any of the following numbers: SR936W, AG9, SR936, SR936SW, SR45, RW33, D394, V394(524), 28017, SB-A4.
The case measures 9.5mm in diameter and 3.6mm thick. Common capacities are from 80 to 84mAh nominal.