Duracell silver oxide electronic watch battery. The high volumetric energy density of Duracell silver oxide button cells, and their ability to deliver this energy at relatively high current drains, makes them ideal for miniature devices where space is limited. Silver cells also have an extremely stable discharge voltage, good shelf life, and the ability to operate over a wide temperature range. 1.2V endpoint voltage. 70 mAh capacity. IEC: SR54, ANSI: 1138SO. Measures 0.457-inches diameter by 0.12-inches height.