Installing the additional battery
X
Insert the battery into the battery case.
X
Insert the battery holder.
X
Tighten the bolts holding the retainer that
prevents the battery in the engine compart-
ment from moving around.
X
Connect the battery (Y page 231).
Charging
G
WARNING
A discharged battery can freeze at tempera-
tures below freezing point. When jump-start-
ing the vehicle or charging the battery, gases
can escape from the battery. There is a risk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
If the indicator/warning lamps do not light up in
the instrument cluster when temperatures are
low, it is probably because the discharged bat-
tery has frozen. Should this be the case, do not
jump-start the vehicle or charge the battery. The
service life of a thawed battery may be shorter.
Start-up behavior may deteriorate, in particular
at low temperatures. Have the thawed battery
checked at a qualified specialist workshop.
G
WARNING
During charging and jump-starting, explosive
gases can escape from the battery. There is a
risk of an explosion.
Particularly avoid fire, open flames, creating
sparks and smoking. Ensure there is sufficient
ventilation while charging and jump-starting.
Do not lean over a battery.
G
WARNING
Battery acid is caustic. There is a risk of injury.
Avoid contact with skin, eyes or clothing. Do
not inhale any battery gases. Do not lean over
the battery. Keep children away from batter-
ies. Wash away battery acid immediately with
plenty of clean water and seek medical atten-
tion.
!
Only charge the installed battery with a bat-
tery charger that has been tested and
approved by the distributor named on the
inside of the front cover. This device allows
the battery to be charged when it is installed
in the vehicle. The vehicle's electronics may
otherwise be damaged.
A battery charger unit specially adapted for
Mercedes-Benz vehicles and tested and
approved by Mercedes-Benz is available as an
accessory. Only this device permits the charging
of the battery in its installed position. Only
charge the installed battery with a battery
charger that has been tested and approved by
Mercedes-Benz, using the jump-start connec-
tion point in the engine compartment. Contact
an authorized Mercedes-Benz Center for infor-
mation and availability. Read the operating
instructions for your charger before charging
the battery.
The additional battery cannot be charged fr
om
the ju
mp-starting connection point.
Recharge the battery more frequently if you use
the vehicle mainly for short trips and/or drive at
low outside temperatures.
X
Charge the battery. Observe the notes in the
operating instructions for your battery
charger.
X
If necessary, install battery. Observe the
notes on reconnecting the battery.
i
Recharge uninstalled, out of service batter-
ies every three months. This will counter self-
discharging and prevent battery damage.
Care
!
Dirty battery clamps and battery surfaces
cause leak currents which lead to the batter-
ies discharging.
!
Do not use cleaning agents containing fuel.
Cleaning agents containing fuel corrode the
battery housing.
!
If dirt gets into the battery cell, battery self-
discharge will increase and the battery may
be damaged.
232
Battery
Maintenance and care
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