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  • A-Class
  • Compact saloon
  • 09/2019
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Notes on the 12 V battery
WARNING Risk of an accident due to work carried out incorrectly on the battery

Work carried out incorrectly on the battery can, for example, lead to a short circuit. This can lead to function restrictions in safety-relevant systems, e.g. the lighting system, ABS (anti-lock braking system) or ESP® (Electronic Stability Program). The operating safety of your vehicle may be restricted.

You could lose control of the vehicle in the following situations:

  • when braking

  • in the event of abrupt steering manoeuvres and/or when the vehicle's speed is not adapted to the road conditions

In the event of a short circuit or a similar incident, contact a qualified specialist workshop immediately.
Do not continue driving.
Always have work on the battery carried out at a qualified specialist workshop.

  • Further information on ABS More

  • Further information on ESP®More

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.

WARNING Risk of explosion due to electrostatic charge

Electrostatic charge can cause sparks which may ignite the highly flammable gas mixture in the battery.

To discharge any electrostatic charge that may have built up, touch the metal vehicle body before handling the battery.

The highly flammable gas mixture is created while the battery is charging and during starting assistance.

WARNING Danger of chemical burns from the battery acid

Battery acid is caustic.

Avoid contact with the skin, eyes or clothing.
Do not lean over the battery.
Do not inhale battery gases.
Keep children away from the battery.
Immediately rinse battery acid off thoroughly with plenty of clean water and seek medical attention immediately.
ENVIRONMENTAL NOTE Environmental damage due to improper disposal of batteries

Batteries contain pollutants. It is illegal to dispose of them with the household rubbish.

Dispose of batteries in an environmentally responsible manner. Take discharged batteries to a qualified specialist workshop or to a collection point for used batteries.

If you have to disconnect the 12 V battery, contact a qualified specialist workshop.

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

  • Risk of explosion.
  • Fire, naked flames and smoking are prohibited when handling the battery. Avoid creating sparks.
  • 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 off with clean water. Consult a doctor if necessary.
  • Wear safety glasses.
  • Keep children away.
  • Observe this Owner's Manual.
If you do not intend to use the vehicle over an extended period of time:

  • activate standby mode, or

  • connect the battery to a battery charger approved by Mercedes-Benz, or

  • consult a qualified specialist workshop to disconnect the battery

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