VAS I-CHECK CURRENT DRAW TEST WITH Battery Charger:VAS5908: Notes
Special tools and workshop equipment required
If software updates or flash campaigns/actions are performed on a vehicle, a charger with at least 70A charging current must be used in order to avoid problems during software updates and flash campaigns/actions.
Battery Charger "VAS 5903". Refer to Battery Charger .
Battery Charger "VAS5908". Refer to Battery Charger .
The current draw test quickly determines the battery condition when the battery is drained. Based on the current draw test result, it can be stated whether the battery needs to be replaced or if it must be fully recharged.
Make sure the battery is checked without electrical equipment connected in parallel when performing the battery current draw test.
Perform a Current Draw Test
-- Disconnect both battery terminals so that the test result is not falsified due to vehicle-specific electrical equipment. Refer to BATTERY, DISCONNECTING AND CONNECTING .
-- Turn on the Battery Charger:VAS5908 and connect the charging clamps to the correct terminals on the battery.
-- With the ←↓ buttons, select >>AUTO MODE<< and activate with the ENTER button (display blinks).
-- With the ←↓ buttons, select I-CHECK and confirm with the ENTER button.
-- Press the ENTER button to activate the entry for battery capacity >>Qbat:<< (blinking).
-- With the ←↓ buttons, set the capacity (Ah) of the battery to be checked and confirm with the ENTER button.
-- With the ←↓ buttons, select the >>TEST START<< menu item and confirm with the ENTER button to start the current draw test. Pay attention to any connection error messages. Refer to Connection Error Messages .
>>TEST<< will blink in the display while the current draw test is in progress. The button locks are activated, and the test in progress can only be canceled if the charging clamps are removed. Pay attention to any interruption error messages. Refer to Interruption Error Messages .
Test Results with the Current Draw L Less Than 100% (battery is faulty)
If the current draw >>I<< is less than 100% at the end of the test, the battery voltage supply is interrupted and >>MAKE WARRANTY CLAIM<< appears in the display.
-- Select >>OK<< using the ←↓ buttons and confirm with the ENTER button to display the result values from the test.
The current draw percentage is displayed in the results window under >>I<<. The displayed data can be transferred to the battery test sheet.
-- With the ←↓ buttons, select >>TEST END<< and confirm with the ENTER button to end the current draw test.
Test Results with Current Draw l Greater than 100% (Battery Intact, But Insufficiently Charged)
If the current draw >>I<< is greater than 100% at the end of the test, the voltage supply continues when charging the battery.
-- Select >>RESULT<< using the ←↓ buttons and confirm with the ENTER button to display the result values from the test.
The current draw percentage is displayed in the results window under >>I<<.
-- With the ←↓ buttons, select >>OK<< or >>TEST END<< and confirm with the ENTER button to switch to the "I-Check charge mode" and to continue to charge the battery.
>>CHARGING<< blinks in the display when in I-Check charge mode until the battery is completely charged. After the charging process is finished, the device automatically switches to maintenance charging. >>RETENTION<< blinks in the display.
A shorted cell test is automatically activated while the battery charges in "I-Check charge mode".
When the shorted cell test is activated, the battery charging is interrupted twice for approximately 30 seconds to measure the voltage.
If the shorted cell test is positive, the charging process is interrupted and >>SHORTED CELL<< appears in the display.