Service Charge

Service Charge

CAUTION:
- Risk of injury. Observe warning notes and safety precautions.
- Batteries that have a colorless or light yellow visual indicator must not 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.
- "Service charging" is not permitted for VW vehicles, because voltage surges can damage the on-board electronics.
- If "Service charging" is still used, the battery must always be separated from the vehicle electrical system.
- During the charging process, always set the operation mode corresponding with the battery operation instructions for battery charger VAS 5900
- "Service Charging" is suitable for:
- wet batteries on which the visual indicator permits charging (indicator black or green).

"Service Charging (SERV)" is only used on sulfated batteries. Batteries with voltage > 14.4 V are charged. A partial removal of the sulfation layer can result from this. Check the visual indicator immediately after charging, before the battery is used.

Special tools, testers and auxiliary items required
- Battery Charger VAS 5903 VAS 5900

NOTE: The battery temperature must be at least 10 degrees 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.







- Using INFO, set the type that corresponds with the battery.
The symbol - 1 - for "service charging of wet batteries" or the symbol - 2 - for "service charging of Gel/Absorbent Glass Mat (AGM) batteries" is indicated in the display.
- Set the capacity (Ah) of the battery to be charged with the corresponding button "Up" arrow up or "Down" (Down arrow).
- Clamp the red charging clamp "+" to the positive battery terminal.
- Clamp 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 % battery voltage, charging unit begins the "Final-charging". The fourth bar is indicated on the display - 1 -. The battery is ready for operation.

NOTE: The "service charging" process is dependent on the degree of sulfation of the battery.

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. Displayed battery voltage does not match the nominal voltage - the 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. The charger does not recognize a battery, when the battery voltage is less than 2 V: The display remains unchanged. The selected operation mode 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.