B battery vs electric battery

B battery and electric battery both are nouns.

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

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

B battery: battery for supplying a constant positive voltage to the plate 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 B battery include battery.

B battery (noun)	electric battery (noun)
battery for supplying a constant positive voltage to the plate of a vacuum tube	a device that produces electricity; may have several primary or secondary cells arranged in parallel or series