Refresh Charging With Battery Charger VAS 5903: Procedure

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-- Turn off the ignition and all electrical consumers and remove the ignition key.

-- Connect the Battery Charger VAS 5903 to the power supply. The last selected operation mode is shown on the display, refer to BATTERY CHARGER VAS 5903 DEVICE DESCRIPTION .

-- Set the battery type with the INFO button.

Fig 1: Identifying Battery Charger Displays - Standard Charge (Wet Batteries Or AGM Batteries)

Courtesy of AUDI OF AMERICA, LLC

The symbol -1- for "refresh - charging wet batteries" or the symbol -2- for "refresh - charging of Gel/Absorbent Glass Mat (AGM) batteries" is indicated in the display.

-- Set the battery capacity (Ah) on the Battery -A- to be charged with the corresponding ↑ button or ↓ button.

-- Connect the red charge terminal (+) to the positive terminal of the Battery -A-.

NOTE: On vehicles with a Start/Stop function and an installed Battery Monitoring Control Module -J367-, the black charge terminal (-) must be connected to the body ground. The Start/Stop system will malfunction when it is connected to the Battery -A- negative terminal.

-- Connect the black charge terminal (-) to the negative terminal of the Battery -A- /negative connector.

The Battery Charger VAS 5900 recognizes the nominal voltage of the connected Battery -A- (6 V/12 V/24 V) and begins the charging process automatically.

The Battery Charger VAS 5900 begins the "final charging" when the charge level is approximately 80 to 85% of the battery voltage. The fourth bar is indicated on the display -1-. The Battery -A- is now ready to be used.

Fig 2: Charging Unit Display, Charge Condition Approx. 80 - 85%

Courtesy of AUDI OF AMERICA, LLC

NOTE: A successful "Refresh charge" depends on the degree of sulfation on the Battery -A-.

Possible malfunctions and how they are handled

Displayed voltage does not match the nominal voltage:
-- Hold down the ↑ button or ↓ button until the charging process begins.
Displayed battery voltage does not match rated voltage - charging process has already begun:
-- Press the START/STOP button two times.

-- Hold down the ↑ button or ↓ button until the charging process begins.
The charger does not recognize a Battery -A-, when the battery voltage is less than 2 V:
The display remains unchanged.

The set operating mode and Ampere-hours (Ah) are displayed.

Battery -A- charging, ending

-- Press the START/STOP -button.

-- Remove the charging clamps from the battery terminals.

-- Disconnect the Battery Charger VAS 5903 from the power.