2020-2026 Mercedes GLA SUV Breakdown assistance -> Battery (vehicle) User Manual
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Breakdown assistance -> Battery (vehicle) for Your Mercedes GLA SUV Second Generation (2020-2026)

When the tyre pressure is correct
#
Unscrew the lling hose from the valve of the
sealed tyre.
#
Screw the valve cap onto the valve of the
sealed tyre.
#
Stow the tyre sealant bottle and the tyre ina-
tion compressor.
#
Drive to the nearest qualied specialist work-
shop and have the tyre, tyre sealant bottle and
lling hose replaced.
Battery (vehicle)
Notes on the 12 V battery
&
WARNING Risk of an accident due to work
carried out incorrectly on the battery
Work carried out incorrectly on the battery
can, for example, lead to a short circuit. This
can restrict functions relevant for safety sys-
tems and impair the operating safety of your
vehicle.
You could lose control of the vehicle in the fol-
lowing situations in particular:
R
when braking
R
in the event of abrupt steering manoeuvres
and/or when the vehicle's speed is not
adapted to the road conditions
#
In the event of a short circuit or a similar
incident, contact a qualied specialist
workshop immediately.
#
Do not drive on.
#
Always have work on the battery carried
out at a qualied specialist workshop.
R
Further information on ABS (/ page 323)
R
Further information on ESP
®
(/ page 324)
For safety reasons, Mercedes-Benz recommends
that you only use batteries which have been
approved for your vehicle by Mercedes-Benz.
All vehicles except vehicles with a lithium-ion bat-
tery
&
WARNING Risk of explosion due to elec-
trostatic charge
Electrostatic charge can ignite the highly
explosive gas mixture in the battery.
#
To discharge any electrostatic charge
that may have built up, touch the metal
vehicle body before handling the battery.
The highly ammable gas mixture is created while
the battery is charging and during starting assis-
tance.
&
WARNING Danger of chemical burns from
the battery acid
Battery acid is caustic.
#
Avoid contact with the skin, eyes or
clothing.
#
Do not lean over the battery.
#
Do not inhale battery gases.
Breakdown assistance
603
F247 0074 02
#
Keep children away from the battery.
#
Immediately rinse battery acid o thor-
oughly with plenty of clean water and
seek medical attention immediately.
All vehicles
+
ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat-
teries
Batteries contain pollutants. It is illegal
to dispose of them with the household rub-
bish.
#
Dispose of batteries in an
environmentally responsible manner.
Take discharged batteries to a qualied
specialist workshop or to a collection
point for used batteries.
If you have to disconnect the 12 V battery, con-
tact a qualied specialist workshop.
Comply with safety notes and take protective
measures when handling batteries.
Risk of explosion if the 12 V battery is
used improperly.
Fire, naked ames and smoking are pro-
hibited when handling the battery. Avoid
creating sparks.
Electrolyte or battery acid is corrosive.
Avoid contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse electrolyte or
acid splashes o with clean water. Consult
a doctor immediately.
Do not place heavy objects on the surface
of the battery or use the battery to sup-
port a person in any way.
Wear safety glasses.
Keep children away.
Observe this Owner's Manual.
Observe the following if you do not intend to use
the vehicle over an extended period of time:
R
If available: activate standby mode
(/ page 320, 321).
R
Alternatively: connect the battery to a battery
charger approved by Mercedes-Benz or con-
sult a qualied specialist workshop to discon-
nect the battery.
Notes on the 48 V battery
&
WARNING Risk of an accident due to work
carried out incorrectly on the battery
Work carried out incorrectly on the battery
can, for example, lead to a short circuit. This
can restrict functions relevant for safety sys-
604
Breakdown assistance
F247 0074 02
tems and impair the operating safety of your
vehicle.
You could lose control of the vehicle in the fol-
lowing situations in particular:
R
when braking
R
in the event of abrupt steering manoeuvres
and/or when the vehicle's speed is not
adapted to the road conditions
#
In the event of a short circuit or a similar
incident, contact a qualied specialist
workshop immediately.
#
Do not drive on.
#
Always have work on the battery carried
out at a qualied specialist workshop.
R
Further information on ABS (/ page 323)
R
Further information on ESP
®
(/ page 324)
+
ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat-
teries
Batteries contain pollutants. It is illegal
to dispose of them with the household rub-
bish.
#
Dispose of batteries in an environ-
mentally responsible manner. Take dis-
charged batteries to a qualied specialist
workshop or to a collection point for
used batteries.
Only have work on the 48 V battery carried out at
a qualied specialist workshop.
Comply with safety notes and take protective
measures when handling batteries.
Risk of explosion if the 48 V battery is
used improperly.
The surface of the 48 V battery may be
hot.
Fire, naked ames and smoking are pro-
hibited when handling the battery. Avoid
creating sparks.
Electrolyte or battery acid is corrosive.
Avoid contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse o splashes of
electrolyte or acid with plenty of clean
water. Consult a doctor immediately.
Do not place heavy objects on the surface
of the battery or use the battery to sup-
port a person in any way.
Do not perform any work on the battery.
Always have any work on the battery car-
ried out at a qualied specialist workshop.
Do not disconnect the battery yourself.
Do not remove the battery yourself. Do
not attempt to open the battery.
Keep children away.
Breakdown assistance
605
F247 0074 02
Wear safety glasses.
Observe this Owner's Manual.
Observe the following if you do not intend to use
the vehicle over an extended period of time:
R
If available: activate standby mode
(/ page 320, 321).
Notes on the high-voltage battery
&
DANGER Risk of re and explosion from
excessive internal pressure of the high-
voltage battery
In the event of a vehicle re, ammable gas
can escape and ignite.
#
Stop the charging process immediately
in case of unusual odours, smoke or
burn marks.
#
Leave the danger zone immediately.
Secure the danger zone at a sucient
distance.
#
Call the re service.
Observe the notes on charging the high-voltage
battery (/ page 291).
Risk of explosion.
Fire, naked ames and smoking are pro-
hibited when handling the battery. Avoid
creating sparks.
Electrolyte or battery acid is corrosive.
Avoid contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse electrolyte or
acid splashes o with clean water. Consult
a doctor immediately.
Wear safety glasses.
Keep children away.
Observe this Owner's Manual.
Notes on starting assistance and charging the 12
V battery
Always use the jump-start connection point in the
engine compartment for battery charging and
starting assistance.
*
NOTE Damage to the battery due to over-
voltage
When charging using a battery charger without
a maximum charging voltage, the battery or
the on-board electronics may be damaged.
#
Only use battery chargers with a maxi-
mum charging voltage of 14.8 V.
606
Breakdown assistance
F247 0074 02
&
WARNING Risk of explosion due to the
ignition of hydrogen gas
If there is a short circuit or sparks are created,
there is a danger of hydrogen gas igniting
when you charge the battery.
#
Take care that the positive terminal of a
connected battery does not come into
contact with vehicle parts.
#
Never place metal objects or tools on a
battery.
#
When connecting and disconnecting the
battery, always observe the sequence of
battery terminals described.
#
During starting assistance, always take
care to connect only battery terminals of
identical polarity.
#
During starting assistance, observe the
sequence described for connecting and
disconnecting the jump leads.
#
Do not connect or disconnect the bat-
tery terminals with the engine running.
&
WARNING Risk of explosion due to explo-
sive mixture of gases
An explosive mixture of gases can escape
from the battery during charging and starting
assistance.
#
Fire, naked ames, smoking and creating
sparks must be avoided.
#
Make sure there is adequate ventilation.
#
Do not stand over the battery.
&
WARNING Risk of explosion from a frozen
battery
A discharged battery may freeze at tempera-
tures slightly above or below freezing point.
During starting assistance or battery charging,
battery gas can be released.
#
Always allow a battery to thaw before
charging it or performing starting assis-
tance.
If the indicator/warning lamps in the instrument
display do not light up in cold temperatures, the
discharged battery is very probably frozen. In this
case you must neither charge the battery nor
jump-start the vehicle.
The operating life of a thawed battery may be
drastically shortened. The starting behaviour may
deteriorate, especially in low temperatures.
It is recommended that a thawed battery be
checked in a qualied specialist workshop.
*
NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
#
Avoid numerous and extended attempts
to start the engine.
Observe the following points during starting assis-
tance and battery charging:
R
Only use undamaged jump leads/charging
cables with a sucient cross-section and
insulated terminal clamps.
R
Uninsulated parts of the terminal clamps must
not come into contact with other metal parts
Breakdown assistance
607
F247 0074 02
while the jump leads/charging cables are con-
nected to the battery/jump-start connection
point.
R
The jump leads/charging cables must not
touch any parts that can move when the
engine is running.
R
Always make sure that neither you nor the bat-
tery are electrostatically charged.
R
Be absolutely sure to keep away from re and
naked ames.
R
Do not lean over a battery.
Observe the following additional points when
charging the battery:
R
Only use chargers that have been tested and
approved by Mercedes-Benz.
R
Read the operating instructions for the
charger before charging the battery.
Observe the additional following points during
starting assistance:
R
For starting assistance, only use batteries with
a nominal voltage of 12 V.
R
The vehicles must not touch each other.
R
Petrol engine: only receive starting assistance
when the engine is cold and the exhaust sys-
tem has cooled.
Starting assistance and charging the 12 V battery
Starting assistance/preparation for charging
#
Secure the vehicle with the electric parking
brake.
#
Shi the transmission to position j.
#
Switch the vehicle and all electrical consum-
ers o.
#
Open the bonnet.
#
Slide the cover 1 of the positive terminal 2
on the jump-start connection point in the
direction of the arrow.
Starting assistance
#
Connect the jump lead to the positive terminal
of your vehicle.
#
Connect the jump lead to the positive terminal
of the donor battery.
608
Breakdown assistance
F247 0074 02
#
Run the engine of the assisting vehicle at
idling speed.
#
Connect the jump lead to the negative termi-
nal of the donor battery.
#
Connect the jump lead to the earth point 3
of your vehicle.
#
Start the engine of your vehicle.
#
Let the engine run for a few minutes.
#
Before disconnecting the jump leads, switch
on an electrical consumer in your vehicle, e.g.
the rear window heating or lights.
When the starting assistance has been comple-
ted:
#
Disconnect the jump lead from the earth point
3 of your vehicle.
#
Disconnect the jump lead from the negative
terminal of the donor battery.
#
Disconnect the jump lead from the positive
terminal of your own vehicle.
#
Disconnect the jump lead from the positive
terminal of the donor battery.
#
Aer removing the jump leads, close the cover
1 of the positive terminal 2.
Plug-in hybrid: if the vehicle has been jump-star-
ted, the electric drive system may not be available
for around 30 minutes.
Further information can be obtained at a qualied
specialist workshop.
Charging the 12 V battery
#
Connect the charging cable to the positive ter-
minal of your vehicle.
#
Connect the charging cable to the positive ter-
minal of the charger.
#
Connect the charging cable to the negative
terminal of the charger.
#
Connect the charging cable to the earth point
3 of your vehicle.
#
Start the charging procedure.
When the charging procedure has been comple-
ted:
#
Disconnect the charging cable from the earth
point 3 of your vehicle.
#
Disconnect the charging cable from the nega-
tive terminal of the charger.
#
Disconnect the charging cable from the posi-
tive terminal of your vehicle.
#
Disconnect the charging cable from the posi-
tive terminal of the charger.
#
Aer removing the charging cables, close the
cover 1 of the positive terminal 2.
Replacing the 12 V battery
#
Observe the notes on the 12 V battery
(/ page 603).
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.
Breakdown assistance
609
F247 0074 02

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