Checking Gravity Of Electrolyte
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Information
- Only for low-maintenance batteries.
Information
- Use commercially available battery acid tester.
- The acid density test provides information about the state of the battery in conjunction with the battery load test.
- The temperature of the battery acid must be at least 10°C.
The gravity of electrolyte must be checked as follows in all battery cells (low-maintenance battery):
- Switch off ignition and remove ignition key.
Emerging battery acid. Observe → 270601 CHECKING BATTERY
- Unscrew all battery plugs (plugs of the battery cells).
- Dip the acid siphon or the pipette into the battery cell and take up the battery acid.
- Read off the gravity of electrolyte in kg/dm3 on the scale of the battery acid tester and compare with the following table.
| Battery charge state in normal climatic zones | Spec. gravity in kg/dm3 |
|---|---|
| discharged | 1, 12 |
| half charged | 1, 20 |
| well charged | 1, 28 |
| Battery charge state in tropical climatic zones (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 in normal climatic zones.
- If the gravity of electrolyte is too low, charge battery.
- After charging the battery, repeat the electrolyte gravity test.
The measured values for the gravity of electrolyte of the individual battery cells should not deviate by more than 0.03 kg/dm3 from each other.
| 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 | ||||||
| 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 greater than 0.03 kg/dm3 . |
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- If the nominal values are not achieved, replace battery.
- If the nominal values are achieved, screw in the original plugs again.