Mercedes-Benz S-Class Saloon 2021, Owner'S Manual

Page: 442 / 621

the jump lead. Start with the donor vehicle
rst.
#
Start the engine of your own vehicle.
#
Let the engines run for several minutes.
#
Before disconnecting the jump leads, switch
on an electrical consumer in your own vehicle,
e.g. the rear window heater or the lighting.
When starting assistance has nished:
#
First, remove the jump lead from the earth
point of your own vehicle and the negative ter-
minal of the donor battery, then remove the
jump lead from the POSITIVE contacts of both
vehicles. Always start with your own vehicle
rst.
#
Close protective cover 2 of POSITIVE con-
tact 3 and close cover 1 .
Plug-in h Plug-in hybr ybrid: id: if your vehicle has been started
with starting assistance, it may not be possible to
use the electric drive for approximately 30
minutes.
Further information can be obtained at a quali ed
specialist workshop.
Char Charging t ging the 12 V batt he 12 V battery ery
#
Connect the POSITIVE contacts of the vehicle
and the charger with the charging cable. Start
with the vehicle rst.
#
Connect the NEGATIVE contact of the charger
and earth point 4 on the vehicle with the
charging cable. Start with the charger rst.
#
Start the charging process.
When the charging process is complete:
#
Remove the charging cable from earth point
4 on the vehicle and the NEGATIVE contact
of the charger rst and then from the POSI-
TIVE contacts on the vehicle and charger.
Always start with the vehicle rst.
#
Close protective cover 2 of POSITIVE con-
tact 3 and close cover 1 .
RReplacing t eplacing the 12 V batt he 12 V battery ery
#
Observe the notes on the 12 V battery
(
/
page 434).
Mercedes-Benz recommends that you have the
12 V battery replaced at a quali ed specialist
workshop, e.g. at a Mercedes-Benz Service
Centre.
Observe the following notes if you want to replace
the battery yourself:
R
Always replace a faulty battery with a battery
which meets the speci c 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.
R
Carry over detachable parts, such as vent
hoses, elbow ttings or terminal covers from
the battery being replaced.
R
Make sure that the vent hose is always con-
nected to the original opening on the side of
the battery.
Fit any existing or supplied cell caps.
Breakdown assistance 439 439