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

https://mobile-car-batterymvlr066.huicopper.com/understanding-the-connection-between-alternators-and-your-car-battery

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