air condition AUDI A4 2000 B5 / 1.G Battery Workshop Manual

27-14

Specific gravity, checking


Special tools, test equipment and auxiliary
items

CAUTION!
Notes:
The specific gravity can be tested immediately after charging the battery.
Commercially available hydrometerShop towelWhen working with battery acid, make sure to follow all "Warnings
and safety precautions for lead-acid batteries." Wear suitable
protective clothing and eye protection. When disposing of batteries, always comply with applicable
Federal, State and local laws regarding the disposal of batteries
and sulfuric acid. In order to better determine the overall condition of a battery, always
perform a specific gravity test in conjunction with the load test. The temperature of the electrolyte must be at least 10 C (50 F).
Pa
ge 16 of 29 Batter
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.27.1

27-18

Load testing


In order to better determine the overall
condition of a battery, always perform a load
test in conjunction with the specific gravity
test.

Special tools, test equipment and auxiliary
items

Note:
When using the VAS1979 or VAS5033 battery tester, it is not necessary
to remove the battery or disconnect the battery cables.
VAS1979 or VAS5033 battery tester
- Follow warnings and safety precautions for lead-acid batteries. Wear
protective clothing such as face shield and leather gloves.
Pa
ge 21 of 29 Batter
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.27.1

27-20

Load test results

The severe load (ohmic resistance) during this
test (high current draw) causes the battery
voltage to drop. If the battery is in good
condition, the voltage value will only drop to the
minimum voltage. The minimum voltage varies
and depends on battery capacity and cold
cranking amps. Cold cranking amps is
understood to be the capacity of the battery in
cold weather. Batteries with high cold cranking
amps are especially important in vehicles with
high compression engines.
If the battery is faulty or has only a weak
charge, the battery voltage will drop off very
quickly "voltage collapse" (voltage below 9.0 V).
After the test is completed, this low voltage will
last for a longer period of time and the voltage
will increase only very slowly. Such a battery
will no longer reach a usable voltage (no-load
voltage) Page 27
-12
.

A battery with the faults described above does
not have the power reserve of an undamaged
battery and must be discarded.
Pa
ge 23 of 29 Batter
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.27.1