Automobile Engineering in ME
The battery is an electrochemical device, which means battery

Does not use an electrolyte
Makes chemicals by mechanical means
Has curved plates instead of flat plates
Uses chemical action to provide electricity

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the alternator
Supply a large amount of power to turn the starter motor when the engine is being started
Act as a reservoir or stabilizer of electricity
Supply electricity to the vehicle's electrical system at all times while the engine is running

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