Eunicell SR621W  364 watch batteries_ 1.55V Silver Oxide coin button cells  

A size 377 battery is the equivalent of a SR626W battery, which is also the same is a AG1 / SG621 battery. 

Eunicell SR621W 364  Watch Cell Battery Specifications
Voltage: 1.55V
Chemistry: Silver Oxide
Diameter: 6.80mm
Height: 2.10mm
Terminal Type: Watch/Button Cell
Package: 10pcs Card; in tray package

HS Code: 8506400010

Eunicell SR621SW non-rechargeable button-coin cell batteries are commonly used in watches, micro LED flashlights, remote controls, cameras, calculators, and many other electronic devices.

Eunicell SR621W Silver Oxide 1.5V Watch Battery Is Also Known As: 364, D364, SP364, 602, 280-34, SB-AG/DG, SR60, SR60L, 531, SR621, GP364, SR621W, SR621SW, T, V364