Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure sulphuric acid
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is pure distilled water

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Automobile Engineering in ME
The function of a second ring is that it is a

Compression ring and aids the top ring in sealing and cooling
Cushion ring which prevents piston slap and knock
Back up compression ring which will work in place of the top ring when it is broken
Back up oil control ring which will work in place of the bottom ring when it is broken

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