Why does a car engine still need a battery if it can generate its own electricity?

Why does a car engine still need a battery if it can generate its own electricity?
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1 Answer

Answer :

It needs the battery to store enough energy to restart theengine when it has been turned off. Without the battery you wouldhave to start the engine manually with a crank (as they did onearly cars before the invention of the electric starter).Also, the battery is a critical part of the voltage regulatorsystem for the alternator used in modern car electrical systems toprevent variations in the voltage of the electrical system withchanges in engine speed, etc.
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