Audi A4: Battery Charger -VAS5900-

Battery Charger -VAS5900- Device Description

The Battery Charger -VAS5900- is designed to charge all 12 V Batteries -A- in the VW group.

Battery Charger -VAS5900-

Control Field Overview

1 - Display

2 - ↑-button "Up"

3 - ↓-button "Down"

4 - START/STOP-button

5 - INFO-button

Battery, Charging with Battery Charger -VAS5900-

  WARNING

Risk of injury. Follow all warning messages and safety precautions. Refer to → Chapter "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.

Special tools and workshop equipment required

• Battery Charger -VAS5900-

  Note

The Battery -A- temperature must be at least 10 ºC.

Procedure

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

- Connect the Battery Charger -VAS5900- to the power supply. The last selected mode is shown on the display. Refer to → Chapter "Battery Charger -VAS5900- Device Description".

- Set the battery type with the INFO button.

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

The Battery Charger -VAS5900- recognizes the nominal voltage of the connected Battery -A- (6 V/12 V/24 V) and begins the charging process automatically.

The Battery Charger -VAS5900- begins the "final charging" when the charge level is approximately 80 to 85%. The fourth bar is indicated on the display -1-. The Battery -A- is ready to be used.

With a charge status of 100%, all bars are indicated on the display -1-.

  Note

• With the "standard charge", parallel operation of electrical consumers during the charging process is possible. The charging time is lengthened by this.
• Depending on the battery type, the Battery Charger -VAS5900- switches to maintenance charging after 1 to 7 hours. To reach a 100% charge level, the Battery -A- should remain connected to the Battery Charger -VAS5900-.

Possible malfunctions and how they are handled

1 - Displayed voltage does not match the nominal voltage:

• Hold down the ↑ button or ↓ button until the charging process begins.

2 - Displayed battery voltage does not match the nominal voltage - the charging process has already begun:

• Press the START/STOP button two times.
• Hold down the ↑ button or ↓ button until the charging process begins again.

3 - The Battery Charger -VAS5900- does not recognize the Battery -A-, if the battery voltage is less than 2V:

The display remains unchanged.

The selected battery type 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 -VAS5900- from the power.

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