A watch battery or button cell is a small form-factor battery designed for use in wrist watches, pocket calculators, hearing aids, and similar compact portable electronics products. Watch batteries are usually a single cell with nominal voltages between 1.5 and 3 V. Common anode materials are zinc or lithium, common cathode materials are manganese dioxide, silver oxide, carbon monofluoride or copper oxide. The cylindrical surface of these types of batteries is part of the positive (+) terminal.
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