Battery - Mercedes-Benz 420 SEL 1989 Owner's Manual

Battery

Check electrolyte level in each cell
approximately every 3 months, and
more frequently during the summer
and in hot climates.
Refill battery with distilled or tap
water. Do not use metal funnels or
push through the overfill-protection
diaphragms in filler holes.
The battery is completely filled when
the water stops draining through the
overfill-protection diaphragm.
To check the battery charge with a
hydrometer, push its tip through the
overfill-protection diaphragm and take
an electrolyte sample.
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Coat battery terminal clamps with
acid-proof grease. Keep battery clean
and dry.
The service life of the battery is also
dependent on its condition of charge.
It must always be sufficiently charged
for the battery to last an optimum
length of time.
Therefore, we recommend that you
have the battery charge checked fre­
quently if you use the vehicle mostly
for short distance trips, or if it is not
used for long periods of time.
Only charge a battery with a battery
charger after it has been discon­
nected from the vehicle electrical cir­
cuit.
Warning!
Battery fluid contains sulfuric
acid. Do not allow this fluid to
come in contact with eyes, skin
or clothing.
In case it does, immediately flush
affected area with water and
seek medical help.
A battery will also produce hyd­
rogen gas, which is flammable
and explosive. Keep flames or
sparks away from battery, avoid
improper connection of jumper
cables, smoking, etc..
While the engine is running the
battery terminal clamps must not
be loosened or detached as
otherwise the alternator and
other electronic units would be
damaged.
Only tow vehicle with the battery
connected.