Open circuit voltage
Note.
- Necessary special devices, control and measuring devices, as well as auxiliary means:
- Hand multimeter (e.g. -VAG 1526A -).
Note.
- The battery must not be loaded with electrical consumers at least 2 hours before the measurement.
- If the battery has been charged, then the measurement should be carried out no earlier than two hours after the end of charging.
1. Measure the battery voltage with a hand-held multimeter. The open circuit voltage of the battery must not fall below 12.5V. If the handheld multimeter reads 12.5V or higher, the battery voltage is normal.
2. If the handheld multimeter indicates a lower battery voltage than 12.5V:
Charge the battery.
After the battery has been charged and at least 2 hours of waiting time, during which the battery must not be loaded by any electrical consumers or charged.
3. Measure the battery voltage with a hand-held multimeter. The open circuit voltage of the battery must not fall below 12.5 V.
4. If the open circuit voltage of the battery is not normal, then you need to replace the battery.
Voltage under load
Note.
- Necessary special devices control and measuring devices, as well as auxiliary means:
- Battery tester -VAS 5097A-.
- Battery tester -VAS 6161-.
Attention.
- There is a risk of injury when handling batteries. Observe the warning and safety instructions.
- Batteries with a colorless or light yellow eye should not be monitored or charged. These batteries need to be replaced.
- Before using the device for testing, you should thoroughly read the manual for its operation and act accordingly during the measurement.
Note.
- The battery temperature must be at least 10°C.
- If the battery was charged, then the measurement should be carried out no earlier than 2 hours after the end of charging.
- For vehicles with "START-STOP" and installed battery monitoring control unit -J367- terminal «-» tester must be connected to body ground. If connected to the negative battery terminal after measurement, system failure may occur "START-STOP".
- If the battery tester is used with the printer -VAS 5097 A-, the battery does not need to be disconnected or removed.
- The load current and minimum voltage differ depending on the capacity of the battery and are indicated on the sticker of the tester.
If the battery tester shows the following results:
- 1 - starter power sufficient
- 2 - starter power is bad
- 3 - starter power is very poor
- 4 - not checked (the device does not turn on, the LED does not light up, it does not print)
Explanation of battery load monitoring
Due to the heavy load of the battery during the monitoring (a large current flows) battery voltage drops.
If the battery is normal, then the voltage value drops no more than to the minimum voltage value.
If the battery is defective or insufficiently charged, the battery voltage drops below the specified minimum value very quickly.
After the monitoring of faulty, discharged or low-charged batteries is completed, this low battery voltage value remains for a very long time; tension increases only very slowly.