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Battery
Notes on the vehicle battery
In order for the battery to achieve the maximum possible service life, it must always be sufficiently charged.
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.
To prevent damage from corrosion, only replace the battery with one that has a central ventilation cover.
Consult a Mercedes-Benz Service Centre if you wish to leave your vehicle parked up for a long period of time.
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Comply with safety precautions and take protective measures when handling batteries.
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Risk of explosion
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Fire, naked flames and smoking are prohibited when handling the battery. Avoid creating sparks.
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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.
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Wear eye protection.
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Keep children away.
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Observe this Owner's Manual.
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 | Environmental note |
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Do not dispose of batteries with the household rubbish. Dispose of defective batteries in an environmentally responsible manner. Take them to a Mercedes-Benz Service Centre or to a special collection point for old batteries.
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| Risk of injury |
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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.
To prevent acid burns, observe the following safety notes when handling batteries:
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Do not lean over batteries.
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Do not place any metal objects on a battery. You could otherwise cause a short circuit and the battery's highly flammable gas mixture could ignite.
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Make sure that you do not create an electrostatic charge, e.g. by wearing synthetic clothing or as a result of friction on fabrics. Therefore, you should not pull or slide the battery over carpets or other synthetic materials.
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Never touch the battery first. To discharge a possible electrostatic charge, step out of the vehicle first and touch the bodywork.
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Do not wipe the battery using a cloth. The battery may explode as a result of electrostatic charge or due to flying sparks.
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Switch the engine off and remove the key before unscrewing or disconnecting the terminal clamps from the battery. You may otherwise destroy electronic components such as the alternator.
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Mercedes-Benz recommends that you have all work involving the battery, e.g. removing, charging and replacing, carried out at a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
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Installation location of the battery
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 | Negative terminal |
 | Positive terminal |
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Example
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Remove the key if you park the vehicle and do not require any electrical consumers. The vehicle will then use very little energy, thus conserving the battery.
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If the battery is discharged, you must use the emergency key element to unlock the vehicle.
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Charging the battery
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Only charge the installed battery using a Mercedes-Benz approved battery charger. Otherwise, the vehicle's electronic system may be damaged. Only charge the battery in a well-ventilated area. As the battery is being charged, gases can escape and generate minor explosions. This may injure you and other persons or cause damage to the paintwork or acid corrosion on the vehicle.
You can obtain information about battery chargers which allow the battery to be charged when still installed from a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
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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.
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Use the electric parking brake to secure the vehicle and use the gear selector lever to set the transmission to P.
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Switch off all electrical consumers.
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Turn the key to position 0 in the ignition lock and remove it.
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Open the bonnet.
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Check that the breather hose is fitted and that there is a cell cap on the opposite side of the battery.
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Remove the cover from the positive terminal.
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Connect the positive clamp of the battery charger to the positive terminal of the battery.
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Connect the negative clamp of the battery charger to the vehicle's earth point.
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Charge the battery. Observe the notes in the operating instructions for your battery charger.
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Disconnect the battery charger after charging.
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Fasten the positive terminal cover.
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Close the bonnet.
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Jump-starting
If your vehicle's
battery is discharged, the engine can be jump-started from another vehicle or
from an external battery using jump leads.
Observe the
following points:
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Jump-starting may
only be performed when the engine and catalytic converter are cold.
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Do not start the
engine if the battery is frozen. Let the battery thaw first.
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Jump-starting may
only be performed from batteries with a nominal voltage of 12 V.
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Only use jump leads
which are protected against polarity reversal and which have a sufficient
cross-section and insulated terminal clamps.
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Jump leads which
are protected against polarity reversal and further information about
jump-starting can be obtained from any Mercedes-Benz Service Centre.
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Avoid repeated and lengthy starting attempts.
Never start the vehicle using a rapid battery charger.
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| Risk of injury |
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There is a risk of acid burns when jump-starting a vehicle due to the gases which escape from the battery. Do not lean over the battery while the engine is being jump-started.
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| Risk of explosion |
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Gases escaping from
the battery during jump-starting may cause minor explosions. Avoid creating
sparks. Keep naked flames away from the battery, and do not smoke.
Comply with safety
precautions and take protective measures when handling batteries. You will find
these under "Battery" in the index.
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Make sure that the
two vehicles do not touch.
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Use the electric
parking brake to secure the vehicle and use the gear selector lever to set the
transmission to P.
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Switch off all
electrical consumers.
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| Connection for suitable earth point
on the vehicle |
| Negative terminal of donor
battery |
 | Positive terminal of donor
battery |
 | Positive terminal on your
vehicle |
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Disconnecting and removing the battery
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If the battery is disconnected:
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there is no brake boosting effect and you will need to apply more pressure to brake and the brake pedal travel will be longer; you may have to depress the brake pedal with full force
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you can no longer turn the key in the ignition and, on vehicles with KEYLESS GO*, pressing the KEYLESS GO button* will have no effect
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the selector lever is locked in position P
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Always disconnect the battery in the order described below. Never swap the terminal clamps. You may otherwise damage the vehicle electronics.
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On vehicles with KEYLESS GO: pull the KEYLESS GO button out more and use the KEYLESS GO key like a normal key.
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Disconnecting the battery
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Use the electric parking brake to secure the vehicle and use the gear selector lever to set the transmission to P.
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Switch off all electrical consumers.
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Turn the key to position 0 in the ignition lock and remove it.
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Open the bonnet.
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Remove the negative terminal clamp from the battery.
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Remove the cover from the positive terminal clamp.
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Remove the positive terminal clamp from the battery.
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Disconnect the breather hose.
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Removing the battery
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Loosen the retainer which holds the battery in place and remove the battery.
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Fitting and connecting the battery
Fitting the battery
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Insert the battery into the battery case.
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Secure the battery with the bracket in the battery case.
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Reconnecting the battery
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Always reconnect the battery in the sequence described below. Never swap the terminal clamps. You may otherwise damage the vehicle electronics.
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Switch off all electrical consumers.
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Connect the positive terminal clamp and secure the cover.
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Connect the negative terminal clamp.
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Connect the breather hose. Make sure that a cell cap is fitted between the battery and the breather hose.
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Close the bonnet.
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