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begin with positive clamp
2
on your own
vehicle first.
During starting assistance: start the
#
engine of the donor vehicle and run at idle
speed.
Connect the negative pole of the donor bat‐
#
tery and ground point
3
of your own vehicle
by using the jumper cable/charging cable.
Begin with the donor battery first.
During starting assistance: start the
#
engine of your own vehicle.
During the charging process: start the
#
charging process.
During starting assistance: let the engines
#
run for several minutes.
During starting assistance: before discon‐
#
necting the jumper cable, switch on an elec‐
trical consumer in your own vehicle, e.g. the
rear window heater or lighting.
When the starting assistance/charging process
is complete, perform the following steps:
First, remove the jumper cable/charging
#
cable from ground point
3
and the negative
pole of the donor battery, then from positive
clamp
2
and the positive pole of the donor
battery. Begin each time with the contacts
on your own vehicle first.
After removing the jumper cable/charging
#
cable, close cover
1
of positive clamp 2.
Further information can be obtained at a quali‐
fied specialist workshop.
Replacing the 12 V battery
Observe the notes on the 12 V battery
#
(
page 316).
/
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualified specialist
workshop, e.g. at an authorized Mercedes-Benz
Center.
Breakdown assistance 321
Observe the following notes if you want to
replace the battery yourself:
Always replace a faulty battery with a battery
R
which meets the specific vehicle require‐
ments.
The vehicle is equipped with an AGM technol‐
ogy battery (Absorbent Glass Mat) or a lith‐
ium-ion battery. Full vehicle functionality is
only guaranteed with an AGM battery or lith‐
ium-ion battery. For safety reasons,
Mercedes-Benz recommends that you only
use batteries which have been tested and
approved for your vehicle by Mercedes-Benz.
Carry over detachable parts, such as vent
R
hoses, elbow fitting or terminal covers from
the battery being replaced.
Make sure that the vent hose is always con‐
R
nected to the original opening on the side of
the battery.
Install any existing or supplied cell caps.
Otherwise, gases or battery acid could
escape.
Make sure that detachable parts are recon‐
R
nected in the same way.
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