Nine-___ battery (4)

I believe the answer is:

volt

(Other definitions for volt that I've seen before include "Electrical SI unit named after a pioneering Italian physicist, d. 1827" , "SI unit of electromotive force" , "A measure of electricity" , "Unit of electric potential difference" , "little force" .)

I've seen this clue in the USA Today and the Newsday.

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