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
- The man in the garage said he would charge up my car battery.
- The garage gave me five pounds for trading in my old car battery, which took the sting of having to buy a new one.
- Does your car battery charged easily?
- My car battery has run down; it needs recharging.