When two unlike materials such as the positive and negative plates (the electrodes) are immersed in an
electrolyte (such as a solution of sulfuric acid and water) voltage is developed. The voltage developed depends on the
types of materials used for electrodes and on the electrolyte used. The voltage is approximately 2.1 volts for a lead-acid
Battery cell. A typical lead-acid Battery consists of six cells and is called a 12-volt Battery. Electrical current is produced
by the chemical reaction between the electrodes and the electrolyte when there is a complete circuit between the positive
and negative terminals. If a battery is rechargeable, such as a lead-acid battery, forcing current through the battery in the
opposite direction with a charger will restore the electrodes and electrolyte to their original states.