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If alkaline batteries are used in devices that tolerate low battery voltage, then nominal capacity is larger, since such a device will not require new batteries soon. Wrist watches often require constant and relatively high voltage, making the nominal capacity of these batteries rather low - such a device will require new replacement batteries rather quickly. The actual capacity depends on the cut-off voltage of the used watch. Their nominal voltage is 1.5 volts, but as the battery is used, their voltage quickly drops. Slightly lower voltage, contains mercury Īlkaline: Alkaline button/coin cell batteries are reliable and cheap batteries. Mercury-oxide batteries were very common wrist watch batteries, but they are not used anymore due to their mercury content.Ī comparison of these chemistries is given in the following table: Chemistry

These batteries also come as zinc-air batteries, which are used mostly as hearing aid batteries, and due to the rather limited operating lifetime, they are not used in watches. There are several chemistry types of these batteries - the most common are alkaline and silver-oxide batteries. Silver-Oxide/Alkaline Button/Coin Cell Batteriesīutton/coin cell batteries are a group of non-rechargeable batteries often used in wrist watches.