Manual: 2011/2012 911

Page: 226

Battery care

  • Ensure that battery is securely mounted.
  • Keep terminals and connections clean and properly tightened.
    Corrosion can be prevented by coating the terminals and connections with petroleum jelly or silicone spray.
  • Ensure that vent caps are securely tightened to prevent spillage.

Checking the electrolyte fluid level
The acid level should be checked more frequently by a qualified specialist workshop during the summer months and in predominantly warm countries.

Battery charging
Automotive batteries loose their efficiency when not in use.

The charge available in your battery can be measured with a battery hydrometer.

We recommend that the battery voltage be tested by your authorized Porsche dealer who has the appropriate equipment.

If the car is not driven for prolonged periods, the battery must be charged at least every 6 weeks.

A discharged battery allows rapid formation of sulfates, leading to premature deterioration of the plates.

Battery Explosion Hazard

  • Charge battery in a well ventilated area due to hydrogen gas explosion risk.
  • Never charge a frozen battery. It may explode because of gas trapped in the ice. Allow a frozen battery to thaw out first.

Eye or Skin Contact

  • If you get electrolyte, which is an acid, in your eyes or on your skin, immediately rinse with cold water for several minutes.

Slow battery charging
Your authorized Porsche dealer will be pleased to advise you about a suitable charger.

  1. Always observe the instructions of the charger manufacturer.
    Depending on the type of charger, the battery may have to be disconnected.
    In this case, always disconnect the negative lead first, and then the positive lead – risk of short circuit!
    Reconnect the leads in reverse order.
  2. Before charging, cold batteries must be warmed up indoors.
  3. Frozen batteries must be thawed out first before being charged.
  4. When charging, ensure that there is adequate ventilation.
  5. Connect the charger to the battery.
    Only plug into the mains and switch the charger on when it is connected up correctly.
  6. Switch on the charger.
  7. After charging, switch off the charger first and then disconnect it.
  • Please see the chapter "PUTTING VEHICLE INTO OPERATION" on page 227.

Winter operation
The capacity and ability of the battery to store power decreases at low outside temperatures.

Moreover, the battery is more heavily loaded in winter months, e.g. by the heated rear window, more frequent use of additional lights, the fans and the windshield wipers, etc.

  • Have the battery checked before the start of winter.

Information
Keep the battery well charged to prevent it from freezing.

A discharged battery can freeze at 23 °F (--5 °C), but a fully charged battery only freezes at --40 °F (--40 °C).

A frozen battery must always be thawed before connecting jump leads.


Replacing battery
The service life of the battery is subject to normal wear; it depends greatly on care, climatic conditions, and driving conditions (distances, loads).

  • Only use an original Porsche battery, with the correct part number, as a replacement.
  • Please observe the disposal instructions for batteries.