Battery Resting Voltage, Checking

Battery, Checking

CAUTION!
Risk of injury. Observe warning notes and safety precautions, refer to => [ Warnings and Safety Precautions ] Battery A!

CAUTION!
In order to prevent damage to the Battery (A) or vehicle, observe battery type descriptions and notes, refer to => [ Battery Types ] Battery Types.

Perform battery checks in the following sequence:

- Visual check, refer to => [ Inspecting ]. Inspecting

- Battery (A) with Visual Indicator, Checking, refer to=> [ Battery With Visual Indicator, Checking ] Battery With Visual Indicator, Checking and Maintenance-Free Battery (A), Checking, refer to => [ Low-Maintenance Battery A, Checking ]. Low-Maintenance Battery A, Checking

- Battery (A) no load voltage, testing, refer to => [ Battery Resting Voltage, Checking ].

- Battery load test with (VAS 5097 A).

Battery Resting Voltage, Checking

Special tools, testers and auxiliary items required

• Hand-Held Multimeter (VAG 1526 B)

CAUTION!
Risk of injury. Observe warning notes and safety precautions. Refer to => [ Warnings and Safety Precautions ] Battery A!

The no load voltage test determines the performance capacity of the Battery (A).

• The Battery (A) to be tested must not have been charged or discharged for at least 2 hours before testing. Charging or discharging within two hours prior to performing test will result in erroneous results.





CAUTION!
• Turn off the ignition and all electrical components.

• Remove the ignition key.

Procedure

- Disconnect the Battery (A). Refer to => [ Battery A, Disconnecting and Connecting ] Battery A, Disconnecting and Connecting.

- Wait at least 2 hours. The Battery (A) must not be charged or discharged during this time.

- Measure the Battery (A) no-load voltage with the Hand-Held Multimeter (VAG 1526 B).





If the Battery (A) was charged based on the result of the no load voltage measurement, proceed as follows:

- Wait at least 2 hours. The Battery (A) must not be charged or discharged during this time.

- Measure the Battery (A) no-load voltage again with the (VAG 1526 B).

If the Battery (A) resting voltage is less than 12.5 V after charging, replace it. Refer to => [ Battery A ] Removal and Replacement.