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