How a Battery Works
A battery is a source of electrical energy that stores electricity for future use.
It develops voltage from the chemical reaction produced when two unlike materials, such as the positive and negative plates, are immersed in the electrolyte,
a solution of sulfuric acid and water. In a typical 6 cells lead-acid battery, the voltage is approximately 2,1 volts per cell, for a total of 12,6 volts.
Electricity flows from the battery as soon as there is a circuit connection between the positive and negative terminals. This happens when any load that needs electricity,
such as the radio, the engine starter and other accessories are connected to the battery.