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Battery charging
Automotive batteries lose their efficiency when
not in use. The charge available in your battery
can be measured with a hydrometer. We rec-
ommend that 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 6 weeks. A discharged battery allows
rapid formation of sulfates, leading to prema-
ture deterioration of the plates.
WARNING
• Charge battery in a well ventilated area.
Keep away from open flame or electrical
spark. Do not smoke. Hydrogen gas gen-
erated by the battery is explosive.
• Electrolyte fluid that may spill during
charging should be washed off with a
solution of warm water and baking soda
to neutralize the acid.
• If you get electrolyte in your eyes or on
your skin, immediately rinse with cold
water for several minutes and call a
doctor.
• Never charge a frozen battery. It may
explode because of gas trapped in the
ice. Allow a frozen battery to thaw out
first.
• Never use a fast charger as a booster to
start the engine. This may seriously dam-
age the vehicle's electrical system and
the charger.
• Fast charging a battery is dangerous
and should only be attempted by a com-
petent mechanic with the proper equip-
ment.
Slow battery charging
WARNING
Heed all warnings and follow instructions
that come with your battery charger.
• Disconnect battery cables and remove the
battery.
• All vent caps should be open. If fluid level is
low, it should be topped up to the full mark
in each cell.
• Connect charger cables.
Charger cables must be connected POS-
ITIVE (+) to POSITIVE (+) and NEGATIVE
(-) to NEGATIVE (-).
• Do not connect or disconnect charger cab-
les while charger is operating.
• 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.
• After charging, turn off charger and dis-
connect charger cables. When the electro-
lyte fluid has stopped "bubbling" in the cells,
close the vent caps.
• Tighten the vent caps and reinstall battery.
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