Porsche 928 GTS 1994 Owner's Manual page 98

Battery care
• Battery should be securely mounted.
• Terminals and connections should be kept
clean and properly tightened. Corrosion can
be prevented by coating terminals and con-
nections with petroleum jelly or silicone spray.
• Vent caps must be securely tightened to pre-
vent spillage.
Winter operation
During the winter months, battery capacity tends
to decrease as temperatures drop. Additionally,
more power is consumed while starting and the
headlights, heater, rear window defogger, etc.,
are used more frequently. Let your Porsche
dealer test the battery's capacity before winter
sets in. A well charged battery will not only pre-
vent starting problems but will also live longer.
Battery charging
Automotive batteries lose their efficiency when
not in use. The charge available in your battery
can be measured with a hydrometer. We recom-
mend that battery voltage be tested by your
Porsche dealer who has the appropriate equip-
ment. If the car is not driven for prolonged peri-
ods, the battery must be charged at least every
6 weeks.
A discharged battery allows rapid formation of
sulfates, leading to premature deterioration of
the plates.
WARNING
Charge battery in a well ventilated area.
Keep away from open flame or electrical
spark. Do not smoke.
generated by the battery is explosive.
Electrolyte fluid that may spill during charg-
ing 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 ex-
plode 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 damage
the vehicle's electrical system and the
charger.
Fast charging a battery is dangerous and
should only be attempted by a competent me-
chanic with the proper equipment.
Slow battery charging
WARNING
Heed all warnings and follow instructions that
come with your battery charger.
• Disconnect battery cables and remove the
battery.
Hydrogen gas
• All vent caps should be open. The fluid level
should meet the indicator
cell.
• Connect charger cables.
Charger cables must be connected POSI-
TIVE (+) to POSITIVE (+) and NEGATIVE (-)
to NEGATIVE (-).
• Do not connect or disconnect charger cables
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 discon-
nect charger cables. When the electrolyte
fluid has stopped "bubbling" in the cells, close
the vent caps.
• Tighten the vent caps and reinstall battery.
mark in each
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