The SR521 silver oxide button battery is a non-rechargeable disposable battery, which is different from the voltage of the zinc air battery of 1.4V and the lithium button battery voltage of 3V. It has a voltage of 1.55V, a capacity of 11mAh, a diameter of 5.8mm and a thickness of 2.1mm.
SR521 silver oxide battery packaging
SR521 silver oxide battery detailed size
SR521 silver oxide battery detailed size discharge curve