Porsche CARRERA GT-2004 Manual page 162

Charge state
A well charged battery will not only prevent start-
ing problems but will also last longer.
In order to avoid discharging the battery
unintentionally:
f Switch off unnecessary electrical loads in city
traffic, on short trips or in a line or traffic.
f Always remove the ignition key from the igni-
tion lock when leaving the car.
f Avoid using the Porsche Online Pro when the
engine is not running.
Battery charging
Automotive batteries loose their efficiency when
not in use.
We recommend that the battery voltage be tested
by your Porsche dealer who has the appropriate
equipment.
If the car is not driven for prolonged periods, the
battery must be charged at least every 2 months.
A discharged battery allows rapid formation of sul-
fates, leading to premature deterioration of the
plates.
f Please observe the chapter "CONNECTING
THE TRICKLE CHARGER" on Page 164.
162
Practical Tips, Emergency Service
Danger!
Hydrogen gas generated by the battery
could cause an explosion, resulting in severe
personal injuries.
f Charge battery in a well ventilated area.
f Never charge a frozen battery. It may explode
because of gas trapped in the ice. Allow a fro-
zen battery to thaw out first.
f If you get electrolyte, which is an acid, in your
eyes or on your skin, immediately rinse with
cold water for several minutes and call a doc-
tor.
Slow battery charging
Caution!
Risk of damage, if the charger is not
connected to the jump lead starting points
provided.
f Do not use carbon fiber parts, surfaces, or
running-gear parts as the ground conductor.
Only connect the charger to the jump lead
starting points provided.
1. Pay attention to all warnings and follow instruc-
tions that come with your battery charger.
2. When charging, ensure adequate ventilation.
3. Ensure that charger is switched off – danger of
short circuit!
4. The ground isolating plug must be plugged in.
5. Connect charger cables to the jump lead start-
ing points.
Charger cables must be connected
POSITIVE (+) to POSITIVE (+) and
NEGATIVE (–) to NEGATIVE (–).
Please observe the chapter "EMERGENCY
STARTING WITH JUMPER CABLES" on
Page 167.
6. Switch on charger.
Normally, a battery should be charged at no
more than 10 percent of its rated capacity.
Rated capacity of the battery in your vehicle is
listed on the battery housing.
7. After charging, turn off charger and disconnect
charger cables in reverse order.