Electrolysis and Storage Batteries
The best indication about the state of charge on a lead-acid battery is given by

specific gravity of electrolyte
output voltage
temperature of electrolyte
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 8 parts of water
4 parts of acid to 4 parts of water
6 parts of acid to 4 parts of water
4 parts of acid to 6 parts of water

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