Electrolysis and Storage Batteries
Local action in a battery is indicated by

excessive gassing under load conditions
both of the listed here
excessive drop in the specific gravity of electrolyte even when the cell is on open circuit
none of the listed here

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Electrolysis and Storage Batteries
In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3

4 parts of acid to 4 parts of water
4 parts of acid to 6 parts of water
6 parts of acid to 4 parts of water
4 parts of acid to 8 parts of water

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