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A fully charged battery will measure at 1.265 specific gravity. A
discharged battery will measure at 1.120 specific gravity or 11.7 volts DC.
A hydrometer is required to measure “specific gravity.”
Most batteries with deep cycle rating require water to be added as
needed. This depends on the amount of draw time that your converter is
in operation.
Use distilled water if possible as it is nearly mineral free. Not keeping
batteries charged will result in shorter life expectancy.
Be sure to keep terminals clean at all times to ensure good contact.
