Important safety notes

Special tools and expert knowledge are required when working on the battery, e.g.

removal and installing. You should therefore have all work involving the battery carried out at a qualified specialist workshop.

WARNING

Work carried out incorrectly on the battery can, for example, lead to a short circuit and damage your vehicle's electronic system. This can disrupt driving safety systems such as ABS (anti-lock braking system) or ESP® (Electronic Stability Program).

• If ABS malfunctions, the wheels can lock during braking. This limits the steerability of the vehicle when braking and the braking distance may increase. There is a risk of accident.

• If ESP® malfunctions, the vehicle will not be stabilized if it starts to skid or a wheel starts to spin. There is a risk of accident.

You should therefore have all work involving the battery carried out at a qualified specialist workshop.

WARNING

Electrostatic build-up can lead to the creation of sparks, which could ignite the highly explosive gases of a battery. There is a risk of an explosion.

Before handling the battery, touch the vehicle body to remove any existing electrostatic build-up.

The highly flammable gas mixture forms when charging the battery as well as when jumpstarting.

Always make sure that neither you nor the battery is electrostatically charged. There is a build-up of electrostatic charge, e.g.: • by wearing clothing made from synthetic fibers
• due to friction between clothing and seats • if you push or pull the battery across the carpet or other synthetic materials • if you wipe the battery with a cloth.

WARNING

During the charging process, a battery produces hydrogen gas. If a short circuit occurs or sparks are created, the hydrogen gas can ignite. There is a risk of an explosion.

• 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.

• It is important that you observe the described order of the battery terminals when connecting and disconnecting a battery.

• When jump-starting, make sure that the battery poles with identical polarity are connected.

• It is particularly important to observe the described order when connecting and disconnecting the jumper cables.

• Never connect or disconnect the battery terminals while the engine is running.

WARNING

Battery acid is caustic. There is a risk of injury.

Avoid contact with the skin, eyes or clothing.

Do not inhale any battery gases. Do not lean over the battery. Keep children away from batteries. Wash battery acid immediately with water and seek medical attention.

Have the battery checked regularly at a qualified specialist workshop.

Observe the service intervals in the Maintenance Booklet or contact a qualified specialist workshop for more information.

battery carried out at a qualified specialist workshop. In the exceptional case that it is necessary for you to disconnect the battery yourself, make sure that: • you switch off the engine and remove the SmartKey. On vehicles with KEYLESSGO, ensure that the ignition is switched off. Check that all the indicator lamps in the instrument cluster are off. Otherwise, electronic components, such as the alternator, may be damaged.

• you first remove the negative terminal clamp and then the positive terminal clamp. Never swap the terminal clamps.

Otherwise, the vehicle's electronic system may be damaged.

• the transmission is locked in position P after disconnecting the battery. The vehicle is secured against rolling away.

You can then no longer move the vehicle.

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

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

WARNING

Fire, open flames and smoking are
prohibited when handling the battery. Avoid creating sparks.

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.

Keep children away.

Observe this Operator's Manual.

For safety reasons, Mercedes-Benz recommends that you only use batteries which have been tested and approved for your vehicle by Mercedes-Benz. These batteries provide increased impact protection to prevent vehicle occupants from suffering acid burns should the battery be damaged in the event of an accident.

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

The vehicle battery, like other batteries, can discharge over time if you do not use the vehicle. In this case, have the battery disconnected at a qualified specialist workshop. You can also charge the battery with a charger recommended by Mercedes- Benz. Contact a qualified specialist workshop for further information.

Have the battery charge level checked more frequently if you use the vehicle mainly for short trips or if you leave it standing idle for a lengthy period. Consult a qualified specialist workshop if you wish to leave your vehicle parked for a long period of time.

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.

If the power supply has been interrupted, e.g. if you reconnect the battery, you will have to:
• set the clock. Information on setting the clock can be found in the separate operating instructions.

On vehicles with COMAND and a navigation system, the clock is set automatically.

• reset the function for folding the exterior mirrors in/out automatically, by folding the mirrors out once  .