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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 gravity of electrolyte test provides information about the state of the battery in connection with the battery load test
  • The temperature of the battery acid must beat 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 into the battery cell using the acid siphon or the pipette 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 BATTERY CHARGING CONDITION & SPECIFIC GRAVITY (NORMAL CLIMATIC ZONES)  .
    BATTERY CHARGING CONDITION & SPECIFIC GRAVITY (NORMAL CLIMATIC ZONES)

    Battery charging condition in normal climatic zones Spec, gravity in kg/dm3
    discharge 1.12
    half charged 1.20
    well charged 1.28
    BATTERY CHARGING CONDITION & SPECIFIC GRAVITY (TROPICAL CLIMATIC ZONE)

    Battery charging condition in tropical climatic zone (hot countries) Spec, gravity in kg/dm3
    discharge 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 gravity of electrolyte 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.

    NON-PERMISSIBLE SPECIFIC GRAVITY OF ELECTROLYTE DEVIATIONS

    Examples of non-permissible specific gravity of electrolyte deviations:
    Battery cells: 1 2 3 4 5 6
      Gravity of electrolyte per cell in kg/dm3
    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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