Mercedes-Benz 190 E 2.6 1989 Owner's Manual page 83

Battery
Check electrolyte level in each cell ap­
proximately 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 dia­
phragms 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.
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 disconnected
from the vehicle electrical circuit.
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 hydro­
gen 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 other­
wise the alternator and other elec­
tronic units would be damaged.
Only tow vehicle with the battery
connected.