A battery vs electric battery

A battery and electric battery both are nouns.

Word	Noun	Adjective	Verb	Adverb
A battery	Yes	No	No	No
electric battery	Yes	No	No	No

As nouns, electric battery is a hypernym of A battery; that is, electric battery is a word with a broader meaning than A battery:

A battery: the battery used to heat the filaments of a vacuum tube
electric battery: a device that produces electricity; may have several primary or secondary cells arranged in parallel or series

Other hypernyms of A battery include battery.

A battery (noun)	electric battery (noun)
the battery used to heat the filaments of a vacuum tube	a device that produces electricity; may have several primary or secondary cells arranged in parallel or series