Electrolysis and Storage Batteries
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of

avoiding excessive gassing
increasing cell capacity
reducing time of charging
Both 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 6 parts of water
4 parts of acid to 8 parts of water
6 parts of acid to 4 parts of water
4 parts of acid to 4 parts of water

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