Porsche Cayman Owner's Manual page 246

Battery care
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Ensure that battery is securely mounted.
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Keep battery surface clean and dry.
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Keep terminals and connections clean.
Corrosion can be prevented by coating the
terminals and connections with petroleum jelly
or silicone spray.
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Ensure that terminal clamps and the vent
hose are firmly secured.
Winter driving
The ability of the battery to deliver and store
power decreases at low outside temperatures.
Moreover, the battery is more heavily loaded in the
winter months, e.g. by the heated rear window,
the more frequent use of additional lights, the
blower and the windshield wipers, etc.
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Have the battery checked before the start
of winter.
Information
Keep the battery fully charged to prevent it from
freezing.
A discharged battery can already freeze at 23 °F
(–5 ºC), but a fully charged one only freezes at
–-40 °F (–-40 ºC).
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If the battery is frozen, thaw it out before
connecting jump leads.
Laying up the vehicle
If the vehicle is left for long periods in the garage
or workshop, the doors and lids should be closed.
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Remove the ignition key or disconnect the
battery if necessary.
244
Minor Repairs
Information
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When the battery is disconnected, the alarm
system ceases to function.
If the vehicle was locked before the battery
was disconnected, the alarm will be triggered
when the battery is reconnected.
To deactivate the alarm system:
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Lock the vehicle and unlock it again.
Alarm system, central locking
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The status of the central locking and alarm
system does not change when you disconnect
the battery.
Information
Even if you put your vehicle out of operation, the
battery still discharges.
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The battery must be charged, i.e. connected
to a charger, approximately every 6 weeks in
order to preserve battery function.
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Store a battery that has been removed in
a dark, cool place that is not exposed to frost.
Replacing the battery
The battery is subject to normal wear: its service
life depends heavily on the care you give it,
climatic conditions and the conditions of use
(distances, loads).
It is not possible to use the details on the battery
case to determine a comparable battery that
meets all the specific requirements of Porsche.
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Have the battery removed and installed only by
your authorized Porsche dealer.
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Only use an original Porsche battery, with the
correct part number, as a replacement. Only
this battery meets the specific requirements of
the vehicle.
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After you install a new battery, it must be
initialised in the control unit.
Please contact your authorized Porsche
dealer.
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Please observe the disposal instructions for
batteries.
Putting vehicle into operation
After the battery is connected or after a fully
discharged battery is charged, the PSM warning
light lights up on the instrument panel and
a message appears on the multi-function display
in the instrument panel to indicate a fault.
This fault can be corrected with a few simple
steps:
1. Start the engine.
To do this, turn the ignition key or the control
unit (on vehicles with Porsche Entry & Drive) to
ignition lock position 2 twice.
2. 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 PSM warning light goes out and the
message is erased from the multi-function
display in the instrument panel.
3. If the warnings do not disappear, then:
Drive carefully to the nearest authorized
Porsche dealer.
Have the fault corrected.
4. After the warnings go out:
Stop the vehicle in a suitable place.
5. Store the end position for the power windows.