Porsche Cayenne Turbo Driver Manual page 322

Charge state
A well-charged battery prevents starting problems
and has a longer service life.
Traffic density, speed limits, requirements
regarding noise, exhaust gas and fuel consump-
tion reduce the engine speed and, hence, the
generator output.
However, the large number of electrical loads has
markedly increased the demand for electrical
power.
In order to avoid unintended battery
discharge:
f Switch off unnecessary electrical loads in city
traffic, on short trips and in queues.
f Always withdraw the ignition key when leaving
the vehicle or
switch ignition off on vehicles that have
Porsche Entry & Drive.
f Avoid using the Porsche Communication
Management system and the audio system
when the engine is not running.
f For information on charging an exhausted
battery: Please observe the chapter
"CHARGING THE BATTERY" on Page 326.
Maintenance note
In the cold season in particular, it may become
necessary to recharge the battery from time to
time.
322
Minor Repairs
Battery care
f Keep battery surface clean and dry.
f Ensure that cell plugs and terminal clamps are
firmly secured.
Checking acid level
(only on low-maintenance batteries)
Check the acid level more frequently in the
summer months and in predominantly warm
countries.
f When topping up, use only clean vessels. In no
case may alcohol (e.g. window cleaner
residues) be permitted to enter the battery.
f Unscrew all plugs.
With the vehicle horizontal, the battery acid
must fill each cell up to the filler mark. These
filler marks are visible through the plug
openings as steps or lateral lugs in the battery.
f Top up with distilled water if necessary.
Do not use acid. Do not overfill.
Winter driving
The ability of the battery to deliver 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 windscreen wipers, etc.
f Have the charge state of the battery checked
before winter begins.
Maintenance note
Keep the battery fully charged to prevent it from
freezing.
A discharged battery can freeze even at –10 °C,
but a fully charged one only freezes at –40 °C.