SEVERELY DISCHARGED BATTERY, CHARGING WITH Battery Charger :VAS5903

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Battery Charger:VAS5900

Fig 1: Battery Charger VAS5903
Courtesy of AUDI

WARNING:

Risk of injury. Follow all warning messages and safety precautions. Refer to WARNINGS AND SAFETY PRECAUTIONS .

WARNING:

Do not check or charge a Battery -A- when the visual indicator has >>no color or is bright yellow<<. Jump starting must not be used!

There is a risk of explosion during testing, charging or jump starting.

These Batteries -A- must be replaced.

CAUTION:

The polarity protection of the charger clamps is not active in the operation mode "charging severely discharged batteries/Support mode". Connect the charger clamps to the battery terminals correctly according to polarity!
Always set the mode that corresponds to the Battery -A- during the charging process. Refer to the Battery Charger:VAS5903 Operating Instructions.
The Battery Charger:VAS5903 does not recognize the severely discharged Battery -A-. Refer to SEVERELY DISCHARGED BATTERIES .
Do not touch START / STOP button when battery cables are incorrectly connected! The Battery Charger:VAS5903 can become damaged.

The :VAS5903 will not automatically recognize the Battery -A- for Batteries -A- with a voltage less than 2 V.

NOTE:

For information in the chapter. Refer to SEVERELY DISCHARGED BATTERIES .

The Battery -A- temperature must be at least 10 °C (50 °F).

Severely discharged batteries in vehicles must be replaced prior to delivery. Pre-existing damage cannot be ruled out.

Procedure

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

-- Connect the :VAS5903 to the power supply. The last selected operation mode is shown on the display. Refer to Battery Charger .

-- Set the battery type with the INFO button.

Fig 2: Identifying Battery Type Symbols

Courtesy of AUDI

The symbol -1- for "service charge of wet batteries" or the symbol -2- for "service charge 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.

-- Press the START/STOP button for about 5 seconds. The menu selection "Charging severely discharged batteries/Support mode" is activated.

-- Press the corresponding ↑ -button or ↓ button to adjust the battery voltage (6 V/12 V/24 V).

NOTE:

If no button is touched within five seconds, the Battery Charger:VAS5903 will return to the main menu (operating mode selection).

-- Select the battery voltage by pressing the START/STOP button.

Then the inquiry about the correct polarity of the charging clamps is made.

-- Check correct polarity connection of charger clamps.

-- Confirm charging clamps are connected to correct poles via START/STOP button.

The Battery Charger:VAS5903 starts to charge the severely discharged Battery -A-.

Battery -A- charging, ending

-- Press the START/STOP -button.

-- Remove the charging clamps from the battery terminals.

-- Disconnect the Battery Charger:VAS5903 from the power.