The typical capacity of, for example, silver-oxide SR626SW is in the 25-27 mAh range, which is larger than the equivalent alkaline LR626 capacity (15-17 mAh). Silver Oxide: Silver-oxide button/coin cell batteries are the most popular type of wrist watch batteries - they are not expensive, often have a shelf life of 10 or more years, they have very constant voltage during operation, which is very similar to the nominal voltage of alkaline batteries (1.55 V vs 1.50 V). Shelf life depends on the manufacturer, but generally newer alkaline batteries have a shelf life of at least 3-5 years. 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. Watch Batteries Frequently Asked Questions (FAQ).

Lithium Titanium Button/Coin Cell Batteries - 'MT' Watch Batteries.Cobalt Titanium Lithium Button/Coin Cell Batteries - 'CTL' Watch Batteries.Lithium Button/Coin Cell Batteries - 'CR' Watch Batteries.Silver-Oxide/Alkaline Button/Coin Cell Batteries - 'SR-SW' Watch Batteries.Instead of silver-oxide/alkaline coin cell batteries, some watches use lithium non-rechargeable batteries, and even some of them support the use of rechargeable button/coin lithium cell batteries. Also, using silver-oxide instead of alkaline batteries can prolong the watch operating time on a single battery. However, finding the exact type and model can be sometimes confusing due to the different labels some battery brands are using for their batteries. When replacing an old battery with the new one, the best practice is to use batteries recommended by the watch manufacturers. Wrist watches are commonly powered using one or rarely two button/coin cell batteries, and these batteries have a limited operating lifetime. Wrist Watch Battery Replacement Chart - Watch Battery Repair

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