Passat L4-1984cc 2.0L DOHC (9A) (1990)
Battery: Testing and Inspection
Specific Gravity
CAUTION: DO NOT expose a fully discharged battery to freezing temperatures; the battery will be damaged.
NOTE:
-
The specific gravity test, in addition to a voltage test under load (described previously) can accurately determine the battery's state of charge.
-
Hydrometers are used for testing specific gravity. Check the hydrometer calibration frequently to ensure accuracy
-
Test electrolyte in all cells. Average specific gravity should be at least 1.225.
-
Correct for electrolyte temperature it necessary:
-
For every 10 °F above 80 °F, add 0.004 to hydrometer reading
-
For every 10 °F below 80 °F, subtract 0.004 from hydrometer reading
Specific Gravity:
% of Charge:
1.265
100 %
1.225
75 %
1.190
50 %
1.155
25 %
1.120
0 %
If specific gravity is above 1.225:
-
Load test battery. See:
If specific gravity is below 1.225:
-
Charge battery. See: Service and Repair
If specific gravity varies by more than 0.040 between cells:
-
Replace battery. See Service and Repair.