If the indicator/warning lampsdonot 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 athawed-
out battery may be shorter. The starting char-
acteristics can be impaired, particularly at low
temperatures. Have the thawed-out battery
checked at aqualifiedspecialist workshop.
Readthe 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 261).
Replacing the 12 Vbattery
Observe the notes on the 12 Vbattery
(Y page 258).
Mercedes-Benz recommends that you have
the 12 Vbattery replaced at aqualifiedspe-
cialist workshop, e.g. at an authorized
Mercedes-Benz Center.
If you want to replace the battery yourself,
observe the following notes:
R
Alwaysreplace adefective 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 yourvehicle 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 originalopening 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 apositive terminal and aground point.
G
WARNING
Battery acid is caustic. There is arisk of injury.
Avoid contact with skin, eyes or clothing. Do not inhaleany battery gases.Donot leanover the
battery. Keep childrenawayfrom batteries. Wash awaybattery acid immediately with plenty of
clean water and seek medicalattention.
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 whilecharging and jump-starting. Do not leanover abattery.
G
WARNING
During the charging process, abattery produces hydrogen gas. If ashort circuit occurs or
sparks are created, the hydrogen gas can ignite. There is arisk of an explosion.
Jump-starting
261
Breakdownassistance
Z
