Charging Severely Discharged Battery
Charging Severely Discharged Battery
Special tools, testers and auxiliary items required
• Battery Charger VAS 5903 (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 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!
• During the charging process, always set the operation mode corresponding with the battery. Refer to Operation instructions for battery charger (VAS 5903)!
• The severely discharged battery is not recognized by the charger. Refer to => [ Severely Discharged Batteries ] Severely Discharged Batteries.
• Do not touch START / STOP if the charge clamps are connected incorrectly! The charger can be damaged.
It is not possible for the battery charger (VAS 5903) to automatically recognize batteries with voltage under 2 Volts.
• Observe the notes in chapter => [ Severely Discharged Batteries ] Severely Discharged Batteries.
• Severely discharged batteries in vehicles must be replaced prior to delivery. Pre-existing damage cannot be ruled out.
• 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 service charge of wet batteries or the symbol - 2 - for service 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.
- Press the START / STOP for approximately 5 seconds. The menu selection "Charging severely discharged batteries/Support mode" is activated.
- Press corresponding button Up [Up Arrow] or Down [Down Arrow], to set respective battery voltage (6 V, 12 V or 24 V).
• If no button is touched within 5 seconds, the charger will return to the main menu (operation mode selection).
- Confirm the selected battery voltage by pressing START / STOP.
Then the inquiry about the correct polarity of the charger clamps is made.
- Verify that the charger clamps are connected to the correct polarity.
- Confirm that the charger clamps are connected to the correct polarity by pressing START / STOP.
The charger begins charging the severely discharged battery.
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.