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A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and 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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An A23 battery is cylindrical and approximately two-thirds the length of an AAA battery, measuring 28.2 mm (1.11 in) long and 10.0 mm (0.39 in) in diameter, with a typical weight of 8 grams. An A23 battery is an 8- cell device with a nominal voltage of 12 V.
But "watch battery" is the official term used in the relevant international standard (IEC 86-3) and is clearly more descriptive. Reverting move. Markus Kuhn 17:26, 26 July 2007 (UTC) I prefer "button cell battery" for title, redundant or not. There are various terms [button, coin, disc]+[battery, cell] and various uses besides in watches.
The American system of watch manufacturing is a set of manufacturing techniques and best-practices to be used in the manufacture of watches and timepieces. It is derived from the American system of manufacturing techniques (also called "armory practices"), a set of general techniques and guidelines for manufacturing that was developed in the 19th century.
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