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Test sequence
- Screw out all battery cell caps.
- -> Immerse hydrometer in one of the cells and draw in electrolyte until float is freely suspended in electrolyte.
- The greater the specific gravity of the electrolyte drawn in, the higher the float will ride.
- The specific gravity in kg/dm3 can be read off from the hydrometer scale.
- Take reading on hydrometer and compare it to values given in table.
Charge state in normal climatic zones Specific gravity
of electrolyte in
kg/dm3
Discharged
1.12
Semi-charged
1.20
Well charged
1.28
Charge state in the tropics
Specific gravity
of electrolyte in
kg/dm3
Discharged
1.08
Semi-charged
1.16
Well charged
1.23
The specific gravity in normal climatic zones must be at least 1.24 kg/dm3.
- Charge battery if specific gravity is too low in all battery cells.
- Repeat testing of electrolyte specific gravity after charging battery.
- Replace battery if readings do not match specifications.
Note:
The measured values for the electrolyte specific gravity of the individual battery cells must not deviate by more
than 0.03 kg/dm3, otherwise battery is to be replaced.
Bat‐
tery
cell:
1
2
3
4
5
6
Specific gravity of electrolyteper cell
in kg/dm3
Audi A3 1997 ➤
Electrical system - Edition 10.2003
1.11 - Checking specific gravity of electrolyte of all cells
15