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2.5
Check no load voltage of battery
WARNING
Danger of injury! Observe warning notices and safety regula‐
tions
⇒ page 2
!
The no load voltage test is used to determine the capacity of the
battery.
Note
The battery must not be charged or discharged for at least 2 hours
before making the measurements. Charging or discharging dur‐
ing this period falsify the test result.
No load voltage
Charge
Condition of battery
11,70 V
0 %
Discharged, no capacity. Heavily discharged.
⇒ page 27
.
12,20 V
50 %
Over a period of time sulphate crystals build-up which can
only be reversed using a considerable amount of energy.
At the same time the active mass expands greatly, which
can cause cracks, which leads to heavy corrosion at the
positive plate.
12,35 V
65 %
♦ On batteries with a magic eye, the display will change
from green to black.
♦ The battery should be recharged on new/vehicles which
have been stored.
12.70 V
100 %
Full capacity.
Special tools and workshop equipment required
♦ Hand multimeter -V.A.G 1526 B-
– Switch off ignition and all electrical consumers and pull out
ignition key.
– Disconnect negative terminal on battery
⇒ page 29
.
– Wait at least 2 hours. The battery must not be charged or dis‐
charged within this period.
– Check battery no load voltage with hand multimeter -V.A.G
1526 B- .
Jetta 2005 ➤ , Bora 2006 ➤
Electrical System - Edition 05.2005
10
Rep. Gr.27 - Starter, current supply, CC
