Changing the battery

You require a CR 2025 3 V cell battery.

the Take the mechanical key out of the SmartKey.

Press mechanical key 2 into the

opening Press mechanical key 2 into the opening in the SmartKey in the direction of the arrow until battery tray cover 1 opens. When doing so, do not hold cover 1 shut.

Remove battery tray cover 1.

Repeatedly tap the SmartKey

against your palm until battery 3 falls out. Repeatedly tap the SmartKey against your palm until battery 3 falls out.
positive terminal facing upwards. Use a lint-free cloth to do so. Insert the new battery with the positive terminal facing upwards. Use a lint-free cloth to do so.
battery is free from lint, grease and all other forms of contamination. Make sure that the surface of the battery is free from lint, grease and all other forms of contamination.
tray cover 1 and then press to close it. Insert the front tabs of battery tray cover 1 and then press to close it.
SmartKey. Insert the mechanical key into the SmartKey.
buttons on the vehicle. Check the function of all SmartKey buttons on the vehicle.

    See also:

    Warranty
    The Service and Warranty Information booklet contains detailed information about the warranties covering your vehicle. Your authorized Mercedes-Benz Center will exchange or repair any defective pa ...

    Charging the batter
    WARNING   Never charge a battery still installed in the vehicle unless a battery charger unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosio ...

    General notes
    If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key. If you use the mechanical key to unlock and open the driver's door, the anti-theft alarm system will be trigg ...