Mercedes-Benz GLC 2016-2022 Owners Manual / Breakdown assistance / Battery (vehicle) / Notes on starting assistance and charging the 12 V battery

Mercedes-Benz GLC : Battery (vehicle) / Notes on starting assistance and charging the 12 V battery

Vehicles with a lithium-ion battery

When charging the battery and during starting assistance, always use the jump-start connection point in the engine compartment.

NOTE Damage to the battery from overvoltage

When charging using a battery charger without a maximum charging voltage, the battery or the on-board electronics may be damaged.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Only use battery chargers with a maximum charging voltage of 14.8 V.

All other vehicles

When charging the battery and during starting assistance, always use the jump-start connection point in the engine compartment.

NOTE Damage to the battery from overvoltage

When charging using a battery charger without a maximum charging voltage, the battery or the on-board electronics may be damaged.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Only use battery chargers with a maximum charging voltage of 14.8 V.

WARNING Risk of explosion from hydrogen gas igniting

There is a danger of hydrogen gas igniting when charging the battery if there is a short circuit or sparks start to form.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Make sure that the positive terminal of the connected battery does not come into contact with vehicle parts.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Never place metal objects or tools on a battery.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery The described order of the battery clamps must be observed when connecting and disconnecting the battery.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery When giving starting assistance, always make sure that you only connect battery terminals with identical polarity.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery During starting assistance, you must observe the described order for connecting and disconnecting the jumper cable.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Do not connect or disconnect the battery clamps while the engine is running.

WARNING Risk of explosion during charging process and starting assistance

During the charging process and starting assistance, the battery may release an explosive gas mixture.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Avoid fire, open flames, creating sparks and smoking.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Make sure there is sufficient ventilation.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Do not lean over a battery.

WARNING Risk of explosion from a frozen battery

A discharged battery may freeze at temperatures slightly above or below freezing point.

During starting assistance or battery charging, battery gas can be released.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Always allow a battery to thaw before charging it or performing starting assistance.

If the indicator/warning lamps in the instrument cluster do not light up at low temperatures, it is very likely that the discharged battery has frozen. In this case you may neither jump-start the vehicle nor charge the battery.

The service life of a battery that has been thawed may be dramatically shortened. The starting characteristics may be impaired, especially at low temperatures.

It is recommended that you have a thawed battery checked at a qualified specialist workshop. Plug-in hybrid: be sure to observe the notes in the Supplement. You could otherwise fail to recognize dangers.

All vehicles

NOTE Damage caused by numerous or extended attempts to start the engine

Numerous or extended attempts to start the engine may damage the catalytic converter due to non-combusted fuel.

Mercedes-Benz GLC. Notes on starting assistance and charging the 12 V battery Avoid numerous and extended attempts to start the engine.

Observe the following points during starting assistance and when charging the battery:

  • Only use undamaged jumper cables/charging cables with a sufficient cross-section and insulated terminal clamps.
  • Non-insulated parts of the terminal clamps must not come into contact with other metal parts while the jumper cable/charging cable is connected to the battery/jump-start connection point.
  • The jumper cable/charging cable must not come into contact with any parts which may move when the engine is running.
  • Always make sure that neither you nor the battery is electrostatically charged.
  • Keep away from fire and open flames.
  • Do not lean over the battery.

Observe the additional following points when charging the battery:

  • Only use battery chargers tested and approved for Mercedes-Benz.
  • Read the battery charger's operating instructions before charging the battery.

Observe the additional following points during starting assistance:

  • Starting assistance may only be provided using vehicles, batteries or other jump start devices with a nominal voltage of 12 V.
  • The vehicles must not touch.
  • Vehicles with a gasoline engine: Jump start the vehicle only when the engine and exhaust system are cold.

    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...

    Starting assistance and charging the 12 V battery

    Requirements: The vehicle is secured with the electric parking brake. Vehicles with automatic transmission: The transmission is in position . The ignition and all electrical consumers are switched off...

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