lead-acid battery vs lead-acid accumulator

lead-acid battery and lead-acid accumulator both are nouns.

Word	Noun	Adjective	Verb	Adverb
lead-acid battery	Yes	No	No	No
lead-acid accumulator	Yes	No	No	No

As nouns, lead-acid battery and lead-acid accumulator are synonyms defined as:

lead-acid battery and lead-acid accumulator: a battery with lead electrodes with dilute sulphuric acid as the electrolyte; each cell generates about 2 volts

lead-acid battery (noun)	lead-acid accumulator (noun)
a battery with lead electrodes with dilute sulphuric acid as the electrolyte; each cell generates about 2 volts	a battery with lead electrodes with dilute sulphuric acid as the electrolyte; each cell generates about 2 volts