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Example of the Button cell​

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Answer:

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 — like a button on a garment, hence the name.Button CELLS are used in:-

Calculator

Toy Phone

Watches etc

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