319 (SR527) Watch Batteries
These batteries are silver oxide button cells, typically used in wrist watches that draw significant current at times. A thicker case provides higher capacity than some cells with the same diameter. The 319 will replace batteries with these names: SR527, SB-DE, 280-60, SB-AE, SR527SW, SR64, TR527SW and D319.
The case measures 5.5mm in diameter, with a height of 2.7mm. Battery output is 1.55V with a typical capacity in the 21mAh range.