Volkswagen Workshop Service and Repair Manuals > Polo Mk4 > Vehicle electrics | Electrical system - General information | Starter-current supply-CC | BatteryA - check | Checking the resting voltage of batteries (unused or stored vehicles)

Checking the resting voltage of batteries (unused or stored vehicles)

WARNING

Risk of injuries! Pay attention to the warning notes and security norms → Chapter.

Special tools and workshop equipment required

t	Portable multimeter or EQ 7318 or EQ 7321 -VAG 1526C-

Note

t	The Battery -A- should not be charged or drained in the two hours that precede measurement. Charging or draining procedures executed in this period will result in incorrect measurement.

t	The purpose of measuring the quiescent voltage is to determine whether it is necessary to further charge the Battery -A- in an unused or stored vehicle.

Checking conditions:

–	Disconnect the terminal from the negative pole of the Battery -A-.

–	Wait at least 2 hours. During this period, the Battery -A- must not be charged or drained.

–	Measure the quiescent voltage of the Battery -A- with the Portable multimeter or EQ 7318 or EQ 7321 -VAG 1526C-.

Quiescent voltage	Condition of charge	State of the battery
11,6 V	0 %	Drained, no charge. Totally drained → Chapter.

Measurement	Procedure
Quiescent voltage ≥ 12.5 V	Quiescent voltage in order, check the charge of the battery → Chapter.
Quiescent voltage < 12.5 V	Charge the battery -A- → Chapter.

If the Battery -A- is charged, proceed as follows, depending on the measurement results:

–	Wait at least 2 hours. During this period, the Battery -A- must not be charged or drained.

–	Measure again the quiescent voltage of the Battery -A- with the Portable multimeter or EQ 7318 or EQ 7321 -VAG 1526C-.

Note

If, after charging the quiescent voltage of the Battery -A- is < (12.5 V), Battery -A-must be replaced.

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