| Severely discharged batteries |
| Explanations regarding severely discharged batteries: |
| Batteries which have not been operational for a long time, e.g. in stock vehicles, discharge themselves. |
| A battery is severely discharged if the no-load voltage has dropped below 11.6 V. Measure no-load voltage → Chapter. |
| If a battery is severely discharged, the battery electrolyte (sulphuric acid/water mixture) consists practically only of water as the sulphuric acid portion is greatly reduced. |
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| Battery acid in severely discharged batteries can already freeze at low frost-point temperature. |
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| Frozen batteries must no longer be used. |
| Severely discharged batteries sulphate, i.e. the entire surface of the plates of the battery harden. The battery acid is not clear but has a weak white colouring. |
| If a severely discharged battery is re-charged immediately after losing its charge, the sulphate deposit forms again. |
| If such batteries are not re-charged, the plates continue to harden and this restricts the battery's ability to accept a charge. This results in a loss of battery power. |
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