Battery, Charging

Battery, Charging

Special tools, testers and auxiliary items required

• Battery Charger (VAS 5903)


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


Batteries that have a colorless or light yellow visual indicator do not have to be tested or charged. Jump starting must not be used!

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

These batteries must be replaced.

• The battery temperature must be at least 10° C.

- Turn off the ignition and all electrical consumers.

- Plug in the electrical system connector of the charger. The last selected operation mode is shown on the display. Refer to => [ Battery Charger VAS 5903 ] Battery Charger VAS 5903.

- Using INFO, set the mode of operation that corresponds with the battery.





The symbol - 1 - for standard charge of wet batteries or the symbol - 2 - for standard charge of Gel/Absorbant Glass Mat (AGM) batteries is indicated in the display.

- Set the capacity (Ah) of the battery to be charged with the corresponding button Up [Up Arrow] or Down [Down Arrow].

- Clamp the red charging clamp + to the positive battery terminal.

• In the case of 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 if it is connected to the negative terminal on the battery.

- Connect the black charging clamp - to the negative battery terminal.

The charger recognizes the nominal voltage of the connected battery (6 V, 12V, or 24 V) and begins the charging process automatically.

At a charge condition of approximately 80 - 85%, charging unit begins the Final-charging. The fourth bar is indicated on the display - 1 -. The battery is ready for operation.





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





• With the battery type standard charge, parallel operation of consumers during the charging process is possible. The charging time is lengthened by this.

• Depending on battery type, the charger switches over to sustain charging after approximately 1-7 hours. To achieve a 100% charge status, the battery should remain connected to the charger for that long.

Possible Malfunctions And How They Are Handled:

1 - Displayed voltage does not match the nominal voltage:

- Hold the appropriate button Up [Up Arrow] or Down [Down Arrow] until the charging process begins.

2 - Displayed Battery Voltage Does Not Match Rated Voltage - Charging Process Has Already Begun:

- Press START / STOP twice.

- Hold the appropriate button Up [Up Arrow] or Down [Down Arrow] until the charging process begins again.

3 - The Charger Does Not Recognize A Battery, When The Battery Voltage Is Less Than 2 V:

The display remains unchanged.

The selected battery type and Ampere hours (Ah) are displayed.

End Battery Charging Process:

- Press START / STOP.

- Remove the black charging clamp - of the charger from the negative battery terminal.

- Remove the red charging clamp + of the charger from the positive battery terminal.

- Pull out the electrical system connector of the charger.