Crossword Genius

Lithium-__ battery (3)

Ross

I believe the answer is:

ion

(Other definitions for ion that I've seen before include "Electrically-charged particle" , "Electrically charged particle" , "Electrically charged atom or group of atoms" , "Charged atom/molecule" , "Subatomic particle" .)

I've seen this clue in the LA Times, the USA Today, The New York Times and the Newsday.
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