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.
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.
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.
Putting vehicle into operation
After the battery is connected or after an exhaustively discharged battery is charged, the multifunctional PSM light lights up on the instrument panel and a message appears on the on-board computer to indicate a fault.
This fault can be remedied with a few simple steps:
Start the engine.
With the vehicle stationary, perform a few steering movements to the left and right and then drive a short distance in a straight line until the multifunctinal PSM light goes out and the message on the on-board computer disappears.
If the warnings do not disappear, then:
Drive carefully to the nearest authorized Porsche dealer.
Have the fault remedied.
After the warnings disappear:
Stop the vehicle in a suitable place.
Perform adaptation of the power windows:
Please see the chapter "STORING END POSITION OF THE WINDOWS" on page 28.