Mercedes-Benz 350 SDL Owner's Manual page 81

Battery
Check electrolyte level in each cell ap­
proximately every three months, and
more frequently during the summer
and in hot climates.
Refill battery with distilled or tap wa­
ter. Do not use metal funnels or push
through overfill-protection diaphragms
in the filler holes.
The battery is completely filled when
the water stops draining through the
overfill-protection diaphragm.
To check the battery charge with a hy­
drometer, push its tip through the
overfill-protection diaphragm and take
an electrolyte sample.
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
frequently 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 disconnected
from the vehicle electrical circuit.
Warning!
Never lean over battery while
connecting or jump starting, you
might get burned.
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
hydrogen gas, which is flamma­
ble 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.
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