Battery
Notes on the 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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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
Your vehicle is equipped with a battery in the boot. It is located under the cover in the spare wheel well.
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Remove the luggage well more.
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 | Electrostatic protection |
 | Battery |
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Saloon: battery in the boot
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| Negative terminal |
| Positive terminal (under cover) |
 | Cell cap |
 | Breather hose |
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Saloon
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On vehicles with a spare tyre*, the battery is located in the recess on the right-hand side.
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Estate: battery under the cover in the luggage compartment on the right-hand side
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Pull the cover upwards and remove it.
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| Electrostatic protection |
| Battery |
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Estate
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| Positive terminal (under cover) |
| Negative terminal |
| Cell cap |
| Breather hose |
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Estate
Electrostatic protection
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Only use rechargeable batteries with electrostatic protection fitted. The electrostatic protection prevents the creation of sparks due to electrostatic buildup, thereby preventing the highly explosive mixture of gases in the battery from igniting.
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You can obtain the electrostatic protection from any Mercedes-Benz Service Centre.
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To remove: pull the electrostatic protection upwards and remove.
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To fit: push the electrostatic protection firmly onto the battery.
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Disconnecting the battery
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If the battery is disconnected:
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the brake boosting effect will not be available. Greater braking force will then be required and the brake pedal travel will be longer. If necessary, depress the brake pedal with maximum 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 on vehicles with automatic transmission*
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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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Firmly depress the parking brake and shift the selector lever to position P on vehicles with automatic transmission*.
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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 boot/luggage compartment.
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Remove the cover more.
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Remove the battery cover.
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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
Saloon
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Disconnect the battery more.
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Loosen the bolt which holds the battery in place.
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Release the strap and remove the battery.
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Estate
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Disconnect the battery more.
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Loosen the bolt which holds the battery in place.
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Release strap and remove the battery.
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Remove spacer from the breather hose on the battery.
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Charging and fitting the battery
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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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| Risk of injury |
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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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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 it is still installed. Otherwise, the vehicle's electronic system may be damaged.
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Only use battery chargers with a maximum charging voltage of 14.8 V.
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Charge the battery. Observe the notes in the operating instructions for your battery charger.
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Refit the charged battery.
To do this, follow the steps described in "Removing the battery" more in reverse order.
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Do not fit refillable batteries without electrostatic protection. The electrostatic discharge could otherwise cause the battery to explode. The battery acid released could cause damage to your vehicle.
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Further information on electrostatic protection more.
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Battery acid is caustic. Avoid contact with the skin, eyes or clothing.
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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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Refit the electrostatic protection if necessary more.
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If the battery power supply has been interrupted (e.g. if it has been reconnected), you must carry out the following tasks:
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