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  2. State of charge - Wikipedia

    en.wikipedia.org/wiki/State_of_charge

    Then specific gravity is given by (mass of electrolyte [g]/ volume of electrolyte [ml])/ (Density of Water, i.e. 1g/1ml). To find SoC from specific gravity, a look-up table of SG vs SoC is needed. Refractometry has been shown to be a viable method for continuous monitoring of the state of charge. The refractive index of the battery electrolyte ...

  3. Lead–acid battery - Wikipedia

    en.wikipedia.org/wiki/Lead–acid_battery

    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 electrolyte; the specific gravity falls as the battery discharges.

  4. Nickel–cadmium battery - Wikipedia

    en.wikipedia.org/wiki/Nickel–cadmium_battery

    The alkaline electrolyte (commonly KOH) is not consumed in this reaction and therefore its specific gravity, unlike in lead–acid batteries, is not a guide to its state of charge. When Jungner built the first Ni–Cd batteries, he used nickel oxide in the positive electrode, and iron and cadmium materials in the negative.

  5. Electrolyte - Wikipedia

    en.wikipedia.org/wiki/Electrolyte

    Sodium is the main electrolyte found in extracellular fluid and potassium is the main intracellular electrolyte; [20] both are involved in fluid balance and blood pressure control. [ 21 ] All known multicellular lifeforms require a subtle and complex electrolyte balance between the intracellular and extracellular environments. [ 19 ]

  6. Nickel–iron battery - Wikipedia

    en.wikipedia.org/wiki/Nickel–iron_battery

    The electrolyte mixture of potassium hydroxide and lithium hydroxide is not consumed in charging or discharging, so unlike a lead-acid battery the electrolyte specific gravity does not indicate state of charge. [7] The voltage required to charge the NiFe battery is equal to or greater than 1.6 volts per cell. [18]

  7. VRLA battery - Wikipedia

    en.wikipedia.org/wiki/VRLA_battery

    A 12V VRLA battery, typically used in small uninterruptible power supplies and emergency lamps. A valve regulated lead–acid (VRLA) battery, commonly known as a sealed lead–acid (SLA) battery, [1] is a type of lead–acid battery characterized by a limited amount of electrolyte ("starved" electrolyte) absorbed in a plate separator or formed into a gel; proportioning of the negative and ...

  8. Alkaline battery - Wikipedia

    en.wikipedia.org/wiki/Alkaline_battery

    The alkaline battery gets its name because it has an alkaline electrolyte of potassium hydroxide (KOH) instead of the acidic ammonium chloride (NH 4 Cl) or zinc chloride (ZnCl 2) electrolyte of the zinc–carbon batteries. Other battery systems also use alkaline electrolytes, but they use different active materials for the electrodes.

  9. 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.