Mersedes SUV Manuals

Battery

Mercedes-Benz M-Class / Mercedes-Benz M-Class Owners Manual / Breakdown assistance / Battery

Important safety notes

In order for the battery to achieve the maximum possible service life, it must always be sufficiently charged.

Have the battery checked regularly at a
Have the battery checked regularly at a qualified specialist workshop, such as an authorized Mercedes-Benz Center.

Adhere to the service intervals indicated in the service booklet or ask a qualified specialist workshop, such as an authorized Mercedes-Benz Center.

Have the battery charge checked more frequently if you use the vehicle mainly for short trips or if you leave it standing idle for a lengthy period.

Only replace a battery with a battery that has been recommended by Mercedes-Benz.

Consult an authorized Mercedes-Benz Center if you wish to leave your vehicle parked for a long period of time.

Comply with safety precautions and take WARNING
Comply with safety precautions and take protective measures when handling batteries.

Risk of explosion


Risk of explosion

Fire, naked flames and


Fire, naked flames and smoking are prohibited when handling the battery.

Avoid creating sparks.

Battery acid is caustic.


Battery acid is caustic.

Avoid contact with the skin, eyes or clothing.

Wear suitable protective clothing, in particular gloves, an apron and a face mask.

Immediately rinse acid splashes off with clean water. Consult a doctor if necessary.

Wear eye protection.


Wear eye protection.

Keep children away.


Keep children away.

Keep children away.


Keep children away.

Environmental note

Batteries contain dangerous


Batteries contain dangerous substances. It is against the law to dispose of them with the household rubbish. They must be collected separately and recycled to protect the environment.

Dispose of batteries in an


Dispose of batteries in an environmentally friendly manner. Return discharged batteries to a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center, or to a special collection point for old batteries.

Failure to follow these instructions can result WARNING
Failure to follow these instructions can result in severe injury or death.

Never lean over batteries while connecting.

You might get injured.

Battery fluid contains sulfuric acid. Do not allow this fluid to come in contact with eyes, skin or clothing. In case it does, immediately flush affected area with water and seek medical help if necessary.

A battery will also produce hydrogen gas, which is flammable and explosive. Keep flames or sparks away from battery, avoid improper connection of jumper cables, smoking etc.

Do not place any metal objects on the battery WARNING
Do not place any metal objects on the battery as this could result in a short circuit.

Use leak-proof batteries only to avoid the risk of acid burns in the event of an accident.

Take care that you do not become statically charged, e.g. by wearing synthetic clothing or rubbing against textiles. For this reason, you also should not pull or push the battery over carpets or other synthetic materials.

Never touch the battery first. First, touch the outside body of the vehicle in order to release any possible electrostatic charges.

Do not rub the battery with rags or cloths. The battery could explode if touched due to electrostatic charge or due to spark formation.

Before working on the battery, e.g. loosening the battery terminals, switch off
Before working on the battery, e.g. loosening the battery terminals, switch off the engine and remove the SmartKey from the ignition. On vehicles with KEYLESS-GO, make sure that the ignition is switched off.

Check that all the indicator lamps in the instrument cluster are off. You may otherwise destroy electronic components, such as the alternator.

Like other batteries, the vehicle battery
Like other batteries, the vehicle battery may discharge over time if you do not use the vehicle. In this case have the battery checked at a qualified specialist workshop, such as an authorized Mercedes-Benz Center. You can also charge the battery with a charger recommended by Mercedes- Benz. Contact an authorized Mercedes- Benz Center for more information.

The battery and the cover of the positive terminal clamp must be installed securely during operation.

Remove the SmartKey if you park the
Remove the SmartKey if you park the vehicle and do not require any electrical consumers. The vehicle will then use very little energy, thus conserving battery power.

Mercedes-Benz recommends that you do not carry out work on batteries yourself, e.g.

removing or charging. Always have this work performed at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.

Charging the battery

Never charge a battery still installed in the WARNING
Never charge a battery still installed in the vehicle unless a battery charger unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosions that may result in paint damage, corrosion or personal injury.

A battery charger unit specially adapted for Mercedes-Benz vehicles and tested and approved by Mercedes-Benz is available as an accessory. It permits the charging of the battery in its installed position. Contact an authorized Mercedes-Benz Center for further information and availability.

Charge the battery in accordance with the separate instructions for the battery charger.

There is a risk of acid burns during the WARNING
There is a risk of acid burns during the charging process due to the gases which escape from the battery. Do not lean over the battery during the charging process.

Battery acid is caustic. Avoid contact with the WARNING
Battery acid is caustic. Avoid contact with the skin, eyes or clothing.

Only charge the installed battery with a
Only charge the installed battery with a battery charger which has been tested and approved by Mercedes-Benz. These battery chargers allow the battery to be charged while still installed.

Only use battery chargers with a
Only use battery chargers with a maximum charging voltage of 14.8 V.

Only charge the battery using the jumpstarting
Only charge the battery using the jumpstarting connection point.

The jump-starting connection point is in the engine compartment.

Ц Open the hood.

Ц Connect the battery charger to the positive terminal and earth point in the same order as when connecting the donor battery in the jump-starting procedure.

Ц Read the battery charger's operating instructions before charging the battery.

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