Get Breakdown assistance -> Battery (vehicle) Guide for Mercedes G Class SUV Fourth Generation (2019-2024)

Battery (vehicle)

Notes on the 12 V battery

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.

For safety reasons, Mercedes-Benz recommends

that you only use batteries which have been tes-

ted and approved for your vehicle by Mercedes-

Benz.

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.

Keep children away from the battery.

Immediately rinse battery acid o thor-

oughly with plenty of clean water and

seek medical attention immediately.

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.

Fire, open 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.

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Breakdown assistance

Keep children away.

Observe this Operator's Manual.

If you do not intend to use the vehicle over an

extended period of time:

Activate standby mode.

Connect the battery to a battery charger

approved by Mercedes-Benz.

Consult a qualied specialist workshop to dis-

connect the battery.

Notes on starting assistance and charging the 12

V battery

When charging the battery and during starting

assistance, always use the jump-start connection

point in the engine compartment.

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.

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.

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.

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 jumper cables.

Do not connect or disconnect the bat-

tery terminals with the engine running.

WARNING Risk of explosion due to a mix-

ture of explosive gases

A mixture of explosive gases can escape from

the battery during charging and jump starting.

Fire, open ames, smoking and creating

sparks must be avoided.

Make sure that there is sucient ventila-

tion.

Do not stand over the battery.

Breakdown assistance

337

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 on the instrument

display do not light up at low temperatures, it is

very likely that the discharged battery has frozen.

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.

It is recommended that you have a thawed battery

checked at 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 when charging the battery:

Only use undamaged jumper cables/charging

cables with a sucient cross-section and

insulated terminal clamps.

Non-insulated parts of the terminal clamps

must not come into contact with other metal

parts while the jumper cable/charging cable

is connected to the battery/jump-start con-

nection point.

The jumper cable/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.

Keep away from re and open ames.

Do not lean over the battery.

Observe the additional following points when

charging the battery:

Only use battery chargers tested and

approved for Mercedes-Benz.

Read the battery charger's operating instruc-

tions before charging the battery.

Observe the additional following points during

starting assistance:

For starting assistance, only use batteries with

a nominal voltage of 12 V.

The vehicles must not touch.

Gasoline engine: only accept starting assis-

tance if the engine and exhaust system are

cold.

Starting assistance and charging the 12 V battery

Requirements

The vehicle is secured with the electric park-

ing brake.

338

Breakdown assistance

The transmission is in position j.

The vehicle and all electrical consumers are

switched o.

The hood is open.

Slide cover 1 of positive contact 2 on the

jump-starting connection point in the direction

of the arrow.

Connect positive contact 2 on your vehicle

to the positive terminal of the donor battery

using the jumper cable/charging cable.

Always begin with positive contact

2 on your

own vehicle rst.

During starting assistance: start the engine of

the donor vehicle and run it at idle speed.

Connect the negative terminal of the donor

battery and ground point 3 of your own vehi-

cle using the jumper cable/charging cable.

Begin with the donor battery rst.

During starting assistance: start the engine of

your own vehicle.

During the charging process: start the charg-

ing process.

During starting assistance: let the engines run

for several minutes.

During starting assistance: before disconnect-

ing the jumper cable, switch on an electrical

consumer in your own vehicle, e.g. the rear

window defroster or lighting.

When the starting assistance/charging process is

complete:

First, remove the jumper cables/charging

cables from ground point 3 and the negative

terminal of the donor battery, then from posi-

tive contact

2 and the positive terminal of

the donor battery. Begin each time with the

contacts on your own vehicle rst.

Aer removing the jumper cables/charging

cables, close cover 1 of positive contact 2.

Further information can be obtained at a qualied

specialist workshop.

Replacing the 12 V battery

Observe the notes on the 12 V battery

(/ page 336).

Mercedes-Benz recommends that you have the

12 V battery replaced at a qualied 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

that meets the specic vehicle requirements.

Breakdown assistance

339

Breakdown assistance -> Battery (vehicle) for Your Mercedes G Class SUV Fourth Generation (2019-2024)

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