| Measuring voltage under load |
| Special tools and workshop equipment required |
| t
| Battery tester -VAS 5097 A- |
| t
| Battery tester -VAS 6161- |
WARNING | t
| When working on the battery - risk of accident. Observe the warning instructions and safety precautions → Chapter. |
| t
| Battery with colourless or bright yellow magic eye must not be subjected to any test or charge. These batteries must be replaced. |
| t
| Carefully read through the operating instructions and observe during the measurement before using the battery tester. |
|
Note | t
| The battery temperature must be at least 10 °C. |
| t
| If the battery was charged, perform measurement only 2 hours after the performed charging. |
| t
| On vehicles with the „start-stop“ system and with the battery monitoring control unit -J367- installed, the „-“ terminal of the tester must be connected to the body mass. If it is connected to the negative terminal of the battery, this can lead to the failure of the „start-stop“ system after the measurement. |
| When using the battery tester with printer -VAS 5097 A-, the battery must not be disconnected or removed. |
| The load current and the minimum voltage differ according to the capacity of the battery and is indicated on the sticker on the tester. |
| If the following result of the battery tester indicates: |
| 1 - | Starting power output adequate |
| 2 - | Starting power output weak |
| 3 - | Starting power output very weak |
| 4 - | not testable (the device does not switch on, LED does not light up, does not print) |
| –
| Connect battery to charger → Chapter and when charging starts, check the current drain → Chapter. |
| Explanations regarding battery load test: |
| The battery voltage drops during this test as a result of the high load on the battery (a high current flows). |
| If the battery is O.K., the voltage drops only as far as the minimum voltage. |
| If the battery is faulty or only has a weak charge, the battery voltage will drop very rapidly below the specified minimum voltage. |
| After completion of the test in case of discharged or poorly discharged batteries, this low voltage is retained for a lengthy period, the voltage rises only slowly again. |
|
|
|
