What is the voltage used by most car batteries?

Most car batteries use a voltage of 12 volts. This is the standard voltage for automotive lead-acid batteries, which are designed to provide the necessary power to start the engine and operate electrical components in the vehicle. The 12-volt system is widely used because it strikes a balance between providing sufficient electrical power while being manageable in terms of size and weight for use in vehicles.

The 12-volt battery typically consists of six individual cells, each producing approximately 2.1 volts, which is how it reaches the standard voltage. This configuration allows for efficient starting power and helps to run the car's electrical systems effectively. The other voltage options, such as 6-volt, 24-volt, and 48-volt, are used in specific applications or certain types of vehicles, but they are not the standard for most cars on the road today.