Get Breakdown assistance -> Battery (vehicle) Guide for Mercedes A Class 4 Door Third Generation (2018-2026)

Breakdown assistance

280

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

tact a qualiꢂed specialist workshop.

Battery (veehicle)

Keep children away from the battery.

Notes on thee 12 V battery

Immediately rinse battery acid oꢁ thor-

oughly with plenty of clean water and

seek medical attention immediately.

Comply with safety notes and take protective

measures when handling batteries.

WARNING Risk of explosion due to elec-

trostatic charge

Risk of explosion.

ENVIRRONMENTAL NOTE Environmental

damage due to improper disposal of bat-

teries

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.

Fire, open ꢀames and smoking are

prohibited when handling the battery.

Avoid creating sparks.

Batteries contain pollutants. It is

illegal to dispose of them with the household

rubbish.

The highly ꢀammable gas mixture is created while

the battery is charging and during starting assis-

tance.

Electrolyte or battery acid is corrosive.

Avoid contact with the skin, eyes or

clothing. Wear suitable protective

clothing, in particular gloves, an apron

and a face mask. Immediately rinse

electrolyte or acid splashes oꢁ with

clean water. Consult a doctor if neces-

sary.

WARNING Danger of chemical burns from

the battery acid

Dispose of batteries in an

environmentally responsible manner.

Take discharged batteries to a qualiꢂed

specialist workshop or to a collection

point for used batteries.

Battery acid is caustic.

Avoid contact with the skin, eyes or

clothing.

Wear safety glasses.

Do not lean over the battery.

Do not inhale battery gases.

Breakdown assistance

281

Keep children away.

Always take care to connect only battery

terminals of identical polarity when jump

starting a vehicle.

NOTE Damage to the battery from over-

voltage

When charging using a battery charger without

a maximum charging voltage, the battery or

the on-board electronics may be damaged.

During starting assistance, it is essential

to observe the sequence described for

connecting and disconnecting the

jumper cables.

Observe this Operator's Manual.

Only use battery chargers with a maxi-

mum charging voltage of 14.8 V.

Do not connect or disconnect the bat-

tery terminals while the engine is run-

ning.

If you do not intend to use the vehicle over an

extended period of time:

WARNINGG Risk of explosion due to igniting

hydrogen gas

Activate standby mode, or

If there is a short circuit or sparks start to

form when charging a battery, there is a dan-

ger of the hydrogen gas igniting.

Connect the battery to a battery charger

approved by Mercedes-Benz, or

WARNINGG Risk of explosion due to a mix-

ture of explosive gases

Consult a qualiꢂed specialist workshop to dis-

connect the battery

A mixture of explosive gases can escape from

the battery during charging and jump starting.

Take care that the positive terminal of a

connected battery does not come into

contact with vehicle parts.

Fire, open ꢀames, smoking and creating

sparks must be avoided.

Notes on startting assistaance and chaarging the 12

V battery

Never place metal objects or tools on a

battery.

Make sure that there is suꢃcient ventila-

tion.

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.

Do not stand over the battery.

Breakdown assistance

282

Keep away from ꢂre and open ꢀames.

Do not lean over the battery.

WARNING Risk of explosion from a frozen

battery

NOTE Damage caused by numerous or

extended attempts to start the engine

A discharged battery may freeze at tempera-

tures slightly above or below freezing point.

Numerous or extended attempts to start the

engine may damage the catalytic converter

due to non-combusted fuel.

Observe the additional following points when

charging the battery:

During starting assistance or battery charging,

battery gas can be released.

Only use battery chargers tested and

approved for Mercedes-Benz.

Avoid numerous and extended attempts

to start the engine.

Always allow a battery to thaw before

charging it or performing starting assis-

tance.

Read the battery charger's operating instruc-

tions before charging the battery.

Observe the following points during starting assis-

tance and when charging the battery:

Observe the additional following points during

starting assistance:

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.

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

cle nor charge the battery.

Only use undamaged jumper cable/charging

cables with a suꢃcient cross-section and

insulated terminal clamps.

For starting assistance, only use batteries with

a nominal voltage of 12 V.

The vehicles must not touch.

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.

Gasoline engine: Only accept starting assis-

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.

tance if the engine and exhaust system are

cold.

The jumper cable/charging cable must not

come into contact with any parts which may

move when the engine is running.

Starting assistance and chharging thee 12 V batterry

Requirements:

The vehicle is secured with the electric park-

It is recommended that you have a thawed battery

checked at a qualiꢂed specialist workshop.

Always make sure that neither you nor the bat-

tery is electrostatically charged.

ing brake.

Breakdown assistance

283

Automatic transmission: The transmission is in

position j.

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 ꢂrst.

First, remove the jumper cable/charging cable

from ground point 3 and the negative 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 ꢂrst.

The vehicle and all electrical consumers are

switched oꢁ.

The hood is open.

During starting assistance: start the engine of

the donor vehicle and run at idle speed.

Aꢄer removing the jumper cable/charging

cable, close cover 1 of positive clamp 2.

Connect the negative pole of the donor bat-

tery and ground point 3 of your own vehicle

by using the jumper cable/charging cable.

Begin with the donor battery ꢂrst.

Further information can be obtained at a qualiꢂed

specialist workshop.

During starting assistance: start the engine of

your own vehicle.

Replacing thee 12 V battery

Observe the notes on the 12 V battery

(/ page 280).

During the charging process: start the charg-

ing process.

During starting assistance: let the engines run

for several minutes.

Mercedes-Benz recommends that you have the

12 V battery replaced at a qualiꢂed specialist

workshop, e.g. at an authorized Mercedes-Benz

Center.

During starting assistance: before disconnect-

ing the jumper cable, switch on an electrical

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

window heater or lighting.

Slide cover 1 of positive clamp 2 on the

jump-starting connection point in the direction

of the arrow.

When the starting assistance/charging process is

complete:

Breakdown assistance -> Battery (vehicle) for Your Mercedes A Class 4 Door Third Generation (2018-2026)

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