A battery used in a car; (in later use chiefly) specifically a lead-acid battery supplying electrical energy for a motor vehicle's ignition system, starter motor, lights, and other electrical components.
Origin
Late 19th century.
Definition of car battery in US English:
car battery
noun
A battery used in a car; (in later use chiefly) specifically a lead-acid battery supplying electrical energy for a motor vehicle's ignition system, starter motor, lights, and other electrical components.