The battery is deeply discharged if its open circuit voltage has dropped below 11.6 V. Measure the open circuit voltage.
Electrolyte (a mixture of sulfuric acid and water) in deeply discharged batteries it consists almost exclusively of water, since the proportion of sulfuric acid is greatly reduced.
Note.
- The electrolyte in deeply discharged batteries can freeze even in slight frosts.
- Frozen batteries cannot be used again. Deeply discharged batteries are sulfated, i.e. the entire surface of the battery elements hardens. The electrolyte is not clean (transparent), and has a whitish color.
- If deeply discharged batteries are charged soon after they are discharged, sulfation will disappear.
- If such batteries are not charged, the battery cells continue to harden and their ability to accept a charge is significantly limited. As a result, the capacity of the battery is reduced.
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