Also called for Coin Cell, Miniature cylindrical cell with a characteristic disc shape.
A watch battery or button cell is a small single cell battery shaped as a squat cylinder typically 5 to 20 mm in diameter and 1 to 6 mm high—like a button on a garment, hence the name. Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, and hearing aids. Lithium cells are generally similar but somewhat larger; they tend to be called either lithium cells or batteries or coin cells rather than button cells.
Button Cell on WiKi: http://en.wikipedia.org/wiki/Button_cell.
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