car battery, automobile battery

a lead-acid storage battery in a motor vehicle; usually a 12-volt battery of six cells; the heart of the car's electrical system

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

• electrical system — equipment in a motor vehicle that provides electricity to start the engine and ignite the fuel and operate the lights and windshield wiper and heater and air conditioner and radio