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

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
Recharging of a maintenance free battery is neither required nor possible
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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Automobile Engineering in ME
The basic function of the suspension is to

Ensure that the steering wheel can deliver a suitable amount of steering force
Automatically correct the effects of over steering
Absorbs vibration and impact forces from the road surface
Ensure that wheel alignment is not disturbed during driving

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