button cell

noun
variants: or button cell battery or button battery

Definition of button cell 

: a small, round, flat battery typically used in watches or other small electronic devices (such as hearing aids) Part of the discussion at the forum centered on ways area residents can help curb mercury emissions by avoiding throwing away products that contain mercury—thermometers, button cell batteries, fluorescent lights, and the like—into the trash. —Matt Gunderson, Boston Globe, 13 Dec. 2007

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First Known Use of button cell

1970, in the meaning defined above

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The first known use of button cell was in 1970

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