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Checking Battery With Battery Tester

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

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.

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.

  1. Connect battery tester to the vehicle battery.
    Fig 1: Connecting Battery Tester To Vehicle Battery
    G09410292Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    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.

  2. 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.
  3. Battery type:  The type of battery (standard equipment - lead acid) >> type Normal  must be selected here.
  4. Test procedure:  The evaluation method for current battery standard equipment stipulates that the values are determined in accordance with DIN  .
  5. 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.
  6. Start the test:
  7. 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.
  8. 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

Battery condition/starting power Charge state Battery tester display
1) 380 A >> state 100% 12.7 V or higher >> 100% charge Battery good, no further action required 
Battery tester display:
Charge state: 12.7 V
Value: 380 A
2) State 100% 11.6 V >> 10% charge Battery good, Battery must be recharged and the measurement repeated  .
Some battery testers also indicate the required charge time and amperage (e.g. Midtronic Inspect 45)
Battery tester display:
Charge state: 11.6 V
Value: 60 A
3) 285 A >> state 75% 12.7 V >> 100% charge Replace battery, Battery must be replaced  .
The battery is damaged and will fail in the foreseeable future.
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