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

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

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Mixes fuel with air
Returns blow by gases from the crankcase to the intake system
Feeds blow by gases to the exhaust manifold
Promotes combustion by creating a swirling movement in the air-fuel mixture

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Automobile Engineering in ME
The main characteristics of a maintenance free (MF) battery is that

Recharging of a maintenance free battery is neither required nor possible
A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
A maintenance free battery has a relatively short shelf life when compared with standard batteries
Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

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