Get Breakdown assistance -> Battery Guide for Mercedes C Class 4 Door 2023

Breakdown assistance

635

When the tyre pressure is correct, unscrew

the ﬁlling hose from the valve of the sealed

tyre.

Screw the valve cap onto the valve of the

sealed tyre.

Do not continue driving.

Consult a qualiﬁed specialist workshop.

Battery (vehicle)

Notes on the 12 V battery

Countries that have Mercedes-Benz Service24h:

you will ﬁnd a sticker with the telephone number,

e.g. on the B‑pillar on the driver's side.

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:

Correct the tyre pressure if it is still at least

130 kPa (1.3 bar/19 psi). See the tyre pres-

sure table on the fuel ﬁller ﬂap for values.

To increase the tyre pressure: switch on the

tyre inﬂation compressor.

when braking

in the event of abrupt steering manoeuvres

and/or when the vehicle's speed is not

adapted to the road conditions

Pull the tyre sealant bottle out of the tyre inﬂa-

tion compressor. Press the locking tabs on the

yellow cap together to do this.

The ﬁlling hose stays on the tyre sealant bot-

tle.

Drive to the nearest qualiﬁed specialist work-

shop and have the tyre, tyre sealant bottle and

ﬁlling hose replaced there.

In the event of a short circuit or a similar

incident, contact a qualiﬁed specialist

workshop immediately.

Do not drive on.

Always have work on the battery carried

out at a qualiﬁed specialist workshop.

To reduce the tyre pressure: press pressure

release button 1 next to manometer 2.

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Breakdown assistance

636

Further information on ABS (/ page 336)

Further information on ESP^®(/ page 338)

(/ page 337)

WARNING Danger of chemical burns from

the battery acid

Battery acid is caustic.

Dispose of batteries in an

environmentally responsible manner.

Take discharged batteries to a qualiﬁed

specialist workshop or to a collection

point for used batteries.

For safety reasons, Mercedes-Benz recommends

that you only use batteries which have been

approved for your vehicle by Mercedes-Benz.

Avoid contact with the skin, eyes or

clothing.

Do not lean over the battery.

Do not inhale battery gases.

Keep children away from the battery.

Immediately rinse battery acid oﬀ thor-

oughly with plenty of clean water and

seek medical attention immediately.

All vehicles except vehicles with a lithium-ion bat-

tery

If you have to disconnect the 12 V battery, con-

tact a qualiﬁed specialist workshop.

Comply with safety notes and take protective

measures when handling batteries.

WARNING Risk of explosion due to elec-

trostatic charge

Electrostatic charge can ignite the highly

explosive gas mixture in the battery.

Risk of explosion if the 12 V battery is

used improperly.

All vehicles

To discharge any electrostatic charge

ENVIRONMENTAL NOTE Environmental

damage due to improper disposal of bat-

teries

that may have built up, touch the metal

vehicle body before handling the battery.

Fire, naked ﬂames 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

The highly ﬂammable gas mixture is created while

the battery is charging and during starting assis-

tance.

Batteries contain pollutants. It is illegal

to dispose of them with the household rub-

bish.

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Breakdown assistance

637

Further information on ESP^®(/ page 338)

(/ page 337)

acid splashes oﬀ with clean water. Consult Notes on the 48 V battery

a doctor immediately.

WARNING Risk of an accident due to work

carried out incorrectly on the battery

Do not place heavy objects on the surface

of the battery or use the battery to sup-

port a person in any way.

ENVIRONMENTAL NOTE Environmental

damage due to improper disposal of bat-

teries

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.

Wear safety glasses.

Batteries contain pollutants. It is illegal

Keep children away.

to dispose of them with the household rub-

bish.

You could lose control of the vehicle in the fol-

lowing situations in particular:

Observe this Owner's Manual.

when braking

Dispose of batteries in an environ-

mentally responsible manner. Take dis-

charged batteries to a qualiﬁed specialist

workshop or to a collection point for

used batteries.

in the event of abrupt steering manoeuvres

and/or when the vehicle's speed is not

adapted to the road conditions

Observe the following if you do not intend to use

the vehicle over an extended period of time:

If available: activate standby mode

(/ page 333).

In the event of a short circuit or a similar

incident, contact a qualiﬁed specialist

workshop immediately.

Do not drive on.

Always have work on the battery carried

out at a qualiﬁed specialist workshop.

Only have work on the 48 V battery carried out at

a qualiﬁed specialist workshop.

Comply with safety notes and take protective

measures when handling batteries.

Alternatively: connect the battery to a battery

charger approved by Mercedes-Benz or con-

sult a qualiﬁed specialist workshop to discon-

nect the battery.

Further information on ABS (/ page 336)

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Breakdown assistance

638

Risk of explosion if the 48 V battery is

used improperly.

Keep children away.

Leave the danger zone immediately.

Secure the danger zone at a suﬃcient

distance.

The surface of the 48 V battery may be

hot.

Wear safety glasses.

Call the ﬁre service.

Observe the notes on charging the high-voltage

Fire, naked ﬂames 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 oﬀ 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 qualiﬁed specialist workshop.

Do not disconnect the battery yourself.

Do not remove the battery yourself. Do

not attempt to open the battery.

Observe this Owner's Manual.

battery (/ page 306).

Risk of explosion.

Observe the following if you do not intend to use

the vehicle over an extended period of time:

Fire, naked ﬂames 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 oﬀ with clean water. Consult

a doctor immediately.

If available: activate standby mode

(/ page 333).

Notes on the high-voltage battery

DANGER Risk of ﬁre and explosion from

excessive internal pressure of the high-

voltage battery

In the event of a vehicle ﬁre, ﬂammable gas

can escape and ignite.

Wear safety glasses.

Stop the charging process immediately

in case of unusual odours, smoke or

burn marks.

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Breakdown assistance

639

Keep children away.

WARNING Risk of explosion due to the

ignition of hydrogen gas

WARNING Risk of explosion due to explo-

sive mixture of gases

Observe this Owner's Manual.

If there is a short circuit or sparks are created,

there is a danger of hydrogen gas igniting

when you charge the battery.

An explosive mixture of gases can escape

from the battery during charging and starting

assistance.

Make sure 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.

Fire, naked ﬂames, smoking and creating

Notes on starting assistance and charging the 12

V battery

sparks must be avoided.

Make sure there is adequate ventilation.

Do not stand over the battery.

All vehicles

When charging the battery and during starting

assistance, always use the jump-start connection

point in the engine compartment.

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 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.

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.

Always allow a battery to thaw before

charging it or performing starting assis-

tance.

Only use battery chargers with a maxi-

mum charging voltage of 14.8 V.

If the indicator/warning lamps in the instrument

cluster do not light up at low temperatures, it is

very likely that the discharged battery has frozen.

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Breakdown assistance

640

In this case you may neither jump-start the vehi-

cle nor charge the battery.

The service life of a battery that has been thawed

may be dramatically shortened. The starting char-

acteristics may be impaired, especially at low

temperatures.

Observe the additional following points when

charging the battery:

Avoid numerous and extended attempts

to start the engine.

Only use battery chargers tested and

approved for Mercedes-Benz.

Observe the following points during starting assis-

tance and when charging the battery:

Read the battery charger's operating instruc-

tions before charging the battery.

Only use undamaged jump lead/charging

cables with a suﬃcient cross-section and

It is recommended that you have a thawed battery

checked at a qualiﬁed specialist workshop.

Observe the additional following points during

starting assistance:

insulated terminal clamps.

Non-insulated parts of the terminal clamps

Plug-in hybrid

Starting assistance may only be provided

must not come into contact with other metal

parts while the jump lead/charging cable is

connected to the battery/jump-start connec-

tion point.

If your vehicle has been started with starting

assistance, it may not be possible to use the elec-

tric drive for approximately 30 minutes.

using vehicles, batteries or other jump start

devices with a nominal voltage of 12 V.

The vehicles must not touch.

Starting assistance is not considered to be a nor-

mal operating condition.

Vehicles with a petrol engine: jump-start the

The jump lead/charging cable must not come

into contact with any parts which may move

when the engine is running.

Always make sure that neither you nor the bat-

tery is electrostatically charged.

vehicle only when the engine and exhaust sys-

tem are cold.

All vehicles

NOTE Damage caused by numerous or

extended attempts to start the engine

Starting assistance and charging the 12 V battery

Preparing starting assistance/charging

Keep away from ﬁre and naked ﬂames.

Do not lean over the battery.

Numerous or extended attempts to start the

engine may damage the catalytic converter

due to non-combusted fuel.

Secure the vehicle by applying the electric

parking brake.

Switch the transmission to position j.

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Breakdown assistance

641

Switch oﬀ the vehicle and all electrical con-

Start the engine of the donor vehicle and run

it at idling speed.

Connect the negative terminal of the donor

battery to earth point 4 of your vehicle using

the jump lead. Begin with the donor battery

ﬁrst.

sumers.

Open the bonnet.

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 the starting assistance procedure is com-

plete:

Example illustrations

First, remove the jump leads from earth point

Open cover 2 of positive contact 3 of the

Open cover 1 of the jump-starting connec-

4 and the negative terminal of the donor bat-

tery, then from positive contact 3 and the

positive terminal of the donor battery. Begin

each time with the contacts on your own vehi-

cle ﬁrst.

jump-starting connection point.

tion point.

Starting assistance

Connect positive contact 3 on your vehicle

to the positive terminal of the donor battery

using the jump lead. Always begin with posi-

tive contact 3 on your own vehicle ﬁrst.

Aꢀer removing the jump leads, close cover 2

of positive contact 3.

Close cover 1.

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Breakdown assistance

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If your vehicle has been started with starting

assistance, it may not be possible to use the elec-

tric drive for approximately 30 minutes.

Further information can be obtained at a qualiﬁed

specialist workshop.

Close cover 1.

have been tested and approved for your vehi-

cle by Mercedes-Benz.

Carry over detachable parts, such as vent

hoses, elbow ﬁttings or terminal covers from

the battery being replaced.

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.

Otherwise, gases or battery acid could

escape.

Make sure that detachable parts are recon-

nected in the same way.

Further information can be obtained at a qualiﬁed

specialist workshop.

Replacing the 12 V battery

Charging

Observe the notes on the 12 V battery

(/ page 635).

Connect positive contact 3 of the vehicle to

the positive terminal of the charger using the

charging cable. Always begin with positive

contact 3 of the vehicle.

Mercedes-Benz recommends that you have the

12 V battery replaced at a qualiﬁed specialist

workshop, e.g. at a Mercedes-Benz Service

Centre.

Observe the following notes if you want to replace

the battery yourself:

Connect the negative terminal of the charger

and earth point 4 on the vehicle with the

charging cable. Start with the charger.

Start the charging process.

Always replace a faulty battery with a battery

When the charging process is complete:

which meets the speciﬁc vehicle require-

ments.

First, remove the charging cable from earth

point 4 and the negative terminal of the

charger, then from positive contact 3 and

the positive terminal of the charger. Begin

each time with the contacts of the vehicle.

Aꢀer removing the charging cable, close cover

2 of positive contact 3.

The vehicle is equipped with an AGM (Absorb-

ent Glass Mat) technology battery or a lithium-

ion battery. Full vehicle functionality is only

guaranteed with an AGM battery or lithium-ion

battery. For safety reasons, Mercedes-Benz

recommends that you only use batteries which

F206 0105 02

Breakdown assistance -> Battery for Your Mercedes C Class 4 Door 2023

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