Most car batteries are lead-acid types, consisting of lead plates and sulfuric acid electrolyte

https://mobile-car-batteryfbck807.tearosediner.net/the-future-of-mobile-car-batteries-innovations-to-watch

Most car batteries are lead-acid types, consisting of lead plates and sulfuric acid electrolyte. They are designed to deliver a high burst of power for starting engines and then recharge while the vehicle runs, maintaining electrical functions efficiently