/ Thesaurus / C Synonyms of car battery Find synonyms for: Noun1. car battery, automobile battery, lead-acid battery, lead-acid accumulatorusage: a lead-acid storage battery in a motor vehicle; usually a 12-volt battery of six cells; the heart of the car's electrical systemWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language