Mercedes-Benz A-Class 2021 Operator's Manual page 279

Slide cover 1 of positive clamp
#
jump-starting connection point in the direc‐
tion of the arrow.
Connect positive clamp 2 on your vehicle to
#
the positive pole of the donor battery using
the jumper cable/charging cable. Always
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
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‐
2 on the
trical consumer in your own vehicle, e.g. the
rear window heater or lighting.
When the starting assistance/charging process
is complete:
First, remove the jumper cable/charging
#
cable from ground point
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
3 of your own vehicle
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 273).
/
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualified specialist
workshop, e.g. at an authorized Mercedes-Benz
Center.
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 a fleece battery.
3 and the negative
Full vehicle functionality is only guaranteed
with a fleece battery. For safety reasons,
Breakdown assistance 277
1 of positive clamp 2.