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Checking gravity of electrolyte

CAUTION: The accident prevention regulations must be observed when handling battery acids.
Wear suitable protective clothing.
Observe the disposal regulations for batteries when disposing of batteries and sulphuric acids.
NOTE:
  • Use commercially available battery acid tester.
  • The electrolyte gravity test provides information about the state of the battery in connection with the battery load test
  • The temperature of the battery acid must be at least 10°C.

The gravity of electrolyte must be checked in all battery cells as follows.

  1. Switch ignition off and remove ignition key.
  2. Unscrew all battery plugs (plugs of the battery cell).
  3. Dip the acid siphon or the pipette into the battery cell and take up the battery acid.
  4. Read off the gravity of electrolyte in kg/dm3 on the scale of the battery acid tester and compare with the following table.
    BATTERY CHARGING CONDITION

    Battery charging condition in normal climatic zones Spec. gravity in kg/dm3
    discharged 1.12
    half charged 1.20
    well charged 1.28
    BATTERY CHARGING CONDITION

    Battery charging condition in tropical climatic zone (hot countries) Spec. gravity in kg/dm3
    discharged 1.08
    half charged 1.16
    well charged 1.23

    The gravity of electrolyte must be at least 1.24 kg/dm3 .

    • If the gravity of electrolyte is too low, charge battery.
    • After charging the battery, repeat the electrolyte gravity test.

    The measuring values for the gravity of electrolyte of the individual battery cells should not deviate by more than 0.03 kg/dm3 from each other.

    GRAVITY OF ELECTROLYTE OF INDIVIDUAL BATTERY CELLS

    Examples of non-permissible specific gravity of electrolyte deviations:
    Battery cell: 1 2 3 4 5 6
      Gravity of electrolyte per cell in kg/dm3
    GRAVITY OF ELECTROLYTE OF INDIVIDUAL BATTERY CELLS

    Examples of non-permissible specific gravity of electrolyte deviations:
    Example 1: 1.24 1.25 1.25 1.10 1.24 1.25
    Example 2: 1.26 1.26 1.25 1.14 1.18 1.24

    Example 1: The gravity of electrolyte in cell 4 is too low.

    Example 2: The gravity of electrolyte in cells 4 and 5 is too low. The specific gravity of electrolyte deviations between the battery cells is larger than 0.03 kg/dm3 .

    • If the nominal values are not achieved, replace battery.
    • If the nominal values are achieved, screw in the original plug again.
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