An electrical battery is a combination of two or more cells used to convert chemical energy into electrical energy
A battery stores electricity. It develops voltage from the chemical reaction produced went two different metals are immersed in an electrolyte solution
In a battery, when a chemical reaction occurs electrons move from one pole to the other. The different metals and electrolytes used give the battery different characteristics the most significant of these is the varying voltage of the battery
A battery is made up of cells in lead acid batteries they contain lead grids onto which are pasted lead and another plate made of lead dioxide, with a sulphuric acid electrolyte into which the plates are immersed.
Lead combines with SO4 (sulphate) to create PbSO4 (lead sulphate), plus one electron.
Lead dioxide, hydrogen ions and SO4 ions, plus electrons from the lead plate, create PbSO4 and water on the lead dioxide plate.
As the battery discharges, both plates build up PbSO4 and water builds up in the acid. The voltage is about 2.2 volts per cell, for vehicle starting normally six cells are connected to produce a 12 Volt battery.
This reaction is reversible. If you apply current to the battery at the right voltage, lead and lead dioxide form again on the plates so you can reuse the battery until the active material has been depleted to render the battery unserviceable