A car battery is ___________.

A car battery typically consists of six cells connected in series, which is a standard configuration for a 12-volt lead-acid battery. Each cell generates approximately 2.1 volts when fully charged, resulting in a total voltage of around 12.6 volts when the battery is at full charge.

The six-cell configuration allows for efficient performance in automotive applications, as it provides sufficient voltage to start the engine and power electrical components within the vehicle. In contrast, other configurations listed, such as having four cells for a 6-volt battery or eight cells for a 12-volt setup, do not match the standard for automotive batteries, which is designed to meet the specific voltage and power requirements. Thus, the correct choice accurately reflects the common structure of a car battery.