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Only replace a battery with a battery that has
been recommended by Mercedes-Benz.
Remove the SmartKey if you park the vehicle
and do not require any electrical consumers.
The vehicle will then use very little energy, thus
conserving battery power.
If the power supply has been interrupted, e.g. if
you reconnect the battery, you will have to:
R
set the clock using the multimedia system
(see the Digital Operator's Manual)
R
reset the function for folding the exterior mir-
rors in/out automatically, by folding the mir-
rors out once (Y page 98)
Charging the battery
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.
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.
!
Only use battery chargers with a maximum
charging voltage of 14.8 V.
!
Only charge the battery using the jump-
starting connection point.
The jump-starting connection point is in the
engine compartment (Y page 282).
X
Open the hood.
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Connect the battery charger to the positive
terminal and ground point in the same order
as when connecting the donor battery in the
jump-starting procedure (Y page 282).
If the indicator/warning lamps do not light up in
the instrument cluster at low temperatures, it is
very likely that the discharged battery has fro-
zen. In this case you may neither jump-start the
vehicle nor charge the battery. The service life of
a thawed-out battery may be shorter. The start-
ing characteristics can be impaired, particularly
at low temperatures. Have the thawed-out bat-
tery checked at a qualified specialist workshop.
Only charge the installed battery with a battery
charger which has been tested and approved by
Mercedes-Benz. A battery charger unit specially
adapted for Mercedes-Benz vehicles and tested
and approved by Mercedes-Benz is available as
an accessory. It permits the charging of the bat-
tery in its installed position. Contact an author-
ized Mercedes-Benz Center for further informa-
tion and availability. Read the battery charger's
operating instructions before charging the bat-
tery.
Replacing the 12 V battery
Observe the notes on the 12 V battery
(Y page 279).
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualified specialist
workshop, e.g. at an authorized Mercedes-Benz
Center.
If you want to replace the battery yourself,
observe the following notes:
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Always replace a defective battery with a bat-
tery which meets the specific requirements of
the vehicle.
The vehicle is equipped with a battery using
AGM (absorbent glass mat) technology or a
battery using EFB (enhanced flooded battery)
technology. Full vehicle functionality is guar-
anteed only with an AGM or EFB battery. If
replacement is necessary, always use the bat-
tery technology originally installed. Switching
between the battery technologies is not per-
mitted. For safety reasons, Mercedes-Benz
recommends that you only use batteries
Battery (vehicle)
281
Breakdown assistance
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