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2. Hydrometer - Wikipedia

   en.wikipedia.org/wiki/Hydrometer

   The state of charge of a lead-acid battery can be estimated from the density of the sulfuric acid solution used as electrolyte. A hydrometer calibrated to read specific gravity relative to water at 60 °F (16 °C) is a standard tool for servicing automobile batteries. Tables are used to correct the reading to the standard temperature.

3. Lead–acid battery - Wikipedia

   en.wikipedia.org/wiki/Lead–acid_battery

   A hydrometer can be used to test the specific gravity of each cell as a measure of its state of charge. Because the electrolyte takes part in the charge-discharge reaction, this battery has one major advantage over other chemistries: it is relatively simple to determine the state of charge by merely measuring the specific gravity of the ...

4. Battery tester - Wikipedia

   en.wikipedia.org/wiki/Battery_tester

   Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

5. Relative density - Wikipedia

   en.wikipedia.org/wiki/Relative_density

   The Urine Specific Gravity diagnostic test is used to evaluate renal concentration ability for assessment of the urinary system. [18] Low concentration may indicate diabetes insipidus, while high concentration may indicate albuminuria or glycosuria. [18] Blood normally has a specific gravity of approximately 1.060. [19]

6. Nickel–cadmium battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–cadmium_battery

   The specific gravity of the electrolyte does not indicate if the battery is discharged or fully charged but changes mainly with evaporation of water. The top of the cell contains a space for excess electrolyte and a pressure release vent.

7. AD-X2 - Wikipedia

   en.wikipedia.org/wiki/AD-X2

   Astin finally thought he had a compromise in which the specific gravity would not be allowed to rise above 1.325, and the tests were performed in June 1952. Astin was now fully in charge of the public testing of AD-X2. Some battery cells were treated and some are controls. But which cells were which was not known to the personnel conducting the ...