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If the indicator/warning lamps do not light up
at low temperatures, it is very likely that the
discharged battery has frozen. In this case,
you may neither charge the battery nor jump-
start the vehicle. The service life of a thawed-
out battery may be shorter. The starting char-
acteristics can be impaired, particularly at low
temperatures. Have the thawed-out battery
checked at a qualified specialist workshop.
Read the battery charger's operating instruc-
tions before charging the battery.
X
Open the hood.
X
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 260).
Replacing the 12 V battery
Observe the notes on the 12 V battery
(Y page 257).
Mercedes-Benz recommends that you have
the 12 V battery replaced at a qualified spe-
cialist workshop, e.g. at an authorized
Mercedes-Benz Center.
If you want to replace the battery yourself,
observe the following notes:
R
Always replace a defective battery with a
battery which meets the specific require-
ments of the vehicle.
The vehicle is equipped with an AGM
(Absorbent Glass Mat) technology battery.
Full vehicle functionality is only guaranteed
with an AGM battery. For safety reasons,
Mercedes-Benz recommends that you only
use batteries which have been tested and
approved for your vehicle by Mercedes-
Benz.
R
Use detachable parts such as breather
hoses, angled connecting pieces or terminal
covers from the battery which is to be
replaced.
R
Make sure that the vent hose is always con-
nected to the original opening on the bat-
tery side.
R
Install existing or supplied cell caps to pre-
vent gases or battery acid from escaping.
R
Make sure that the detachable parts are
connected again in the same way.
Jump-starting
For the jump-starting procedure, use only the jump-starting connection point in the engine com-
partment, consisting of a positive terminal and a ground point.
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 batteries. Wash away battery acid immediately with plenty of
clean water and seek medical attention.
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
During the charging process, a battery produces hydrogen gas. If a short circuit occurs or
sparks are created, the hydrogen gas can ignite. There is a risk of an explosion.
260
Jump-starting
Breakdown assistance
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