Editing Electrochemical cell (section)

=== Secondary cell ===
[[File:Photo-CarBattery.jpg|thumb|Lead acid car battery (secondary cell)]]
[[File:Secondary Cell Diagram.svg|thumb|Circuit diagram of a secondary cell showing difference in cell potential, and flow of electrons through a resistor.]]
{{main|Rechargeable battery}}
A secondary cell produces current by reversible chemical reactions (ex. [[Lead–acid battery|lead-acid battery]] car battery) and is [[Rechargeable battery|rechargeable]].{{cn|date=December 2024}}

Lead-acid batteries are used in an automobile to start an engine and to operate the car's electrical accessories when the engine is not running. The alternator, once the car is running, recharges the battery.{{cn|date=December 2024}}

It can perform as a galvanic cell and an electrolytic cell. It is a convenient way to store electricity: when current flows one way, the levels of one or more chemicals build up (charging); while it is discharging, they reduce and the resulting electromotive force can do work.{{cn|date=December 2024}}

They are used for their high voltage, low costs, reliability, and long lifetime.{{cn|date=December 2024}}