However, the composition can affect service life and voltage stability. Properties of cell chemistries Ĭells of different chemical composition made in the same size are mechanically interchangeable. Duracell has attempted to mitigate this by adding a bitter coating to their batteries. Mercuric oxide button cells were formerly common, but are no longer available due to the toxicity and environmental effects of mercury.īutton cells are dangerous for small children, as when swallowed they can cause severe internal burns and significant injury or death. Common cathode materials are manganese dioxide, silver oxide, carbon monofluoride, cupric oxide or oxygen from the air. Common anode materials are zinc or lithium. īutton cells are single cells, usually disposable primary cells. Relatively high-power devices such as hearing aids may use a zinc–air battery, which has a much higher capacity for a given size, but dries out after a few weeks even if not used. Most button cells have low self-discharge, holding their charge for a long time if not used. ![]() Devices using button cells are usually designed around a cell giving a long service life, typically well over a year in continuous use in a wristwatch. ![]() Wider variants are usually called coin cells. Stainless steel usually forms the bottom body and positive terminal of the cell insulated from it, the metallic top cap forms the negative terminal.īutton cell use in RTC modules as power sourceīutton cells are used to power small portable electronics devices such as wrist watches and pocket calculators. Small battery Button, coin, or watch cellsĪ button cell, watch battery, or coin battery is a small single-cell battery shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high - resembling a button.
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