270601 Checking battery with battery tester
WM 270601 Checking battery with battery tester
Checking battery with battery tester
=> Workshop Equipment and Special Tools Manual See Tools and Equipment, 3.9.1 Battery testers/chargers.
Information
Before checking the battery with a battery tester, the voltage at the battery must remain static for a short time.
The described sequence must be followed to ensure this rest period is observed.
1. Park the vehicle on the lifting platform.
2. Switch off lights, switch off ignition, remove ignition key and open the luggage compartment lid.
Information
No loads (e.g. opening doors, switching on light/radio, etc.) may be activated while the vehicle is jacked up and raised on the lifting platform.
The time is long enough for the battery to rest for a few minutes.
3. Remove battery cover. -> 27121900 Removing and installing battery cover - section on "Removing" 27121900 Removing and installing battery cover
4. Connect battery tester to the vehicle battery.
=> Refer to Tools and Equipment.
Connecting battery tester to vehicle battery
Information
The description given below is a general description. It is therefore important to follow the directions in the operating instructions for the battery tester used.
Information
Before the battery test:
If the temperature of the battery cannot be estimated, e.g. if the outside temperature and the temperature in the workshop area differ considerably, the temperature of the battery must be measured using a commercially available infrared temperature gun, for example.
Information
For battery measurements in the vehicle:
Measurements using the battery tester must be taken at the battery poles.
5. Battery temperature: The actual battery temperature must be input on the battery tester. If the temperature of the battery cannot be estimated, e.g. if the outside temperature and the temperature in the workshop area differ considerably, the temperature of the battery must be measured using a commercially available infrared temperature gun, for example.
6. Battery type: The type of battery (standard equipment - lead acid) >> type Normal must be selected here.
7. Test procedure: The evaluation method for current battery standard equipment stipulates that the values are determined in accordance with DIN.
8. Battery value: The battery value (low-temperature test current) is read off from the battery, e.g. the value is 340 A for a 12V 70 Ah battery. The value is 380 A for a 12V 80 Ah battery.
9. Start the test:
10. After a short time, the result of the test will be displayed. The functional state and the charge state, for example, will be displayed, depending on the type of tester.
11. The battery testers measure the battery voltage and the low-temperature test current. The measured values are compared and the subsequent procedure is displayed on the tester based on these values.
Different examples for a 12V 80 Ah 380 A battery
