What is a button cell
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A watch battery or button cell 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. ... Most button cells have low self-discharge and hold their charge for a long time if not used.
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A small, round, flat battery typically used in watches or other small electronic devices
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