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How to Replace the Key Battery on a Mercedes B-Class

Model: Mercedes Classe B MK 2, W246 - Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
Part: Key

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If the doors do not unlock using the remote control of the Mercedes B-Class, it may be due to a flat battery. To replace it, you will need to purchase a new CR2025 battery.

To perform the operation, first extract the mechanical key and use it to lever from the opposite side of the slot to remove the black cover. Once the cover is removed, simply take out the battery and replace it, ensuring it does not fall.

After that, you can reposition the cover by inserting it first from the side with the teeth and reinserting the metal key into its housing.


Updated on 23 June 2026 by ScegliAuto


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On the instrument cluster of the MG ZS, the tire pressure light that appears can be reset by inflating the tires to the correct pressure: this value will be indicated on the sticker attached to the driver's door pillar. Once the tires have been properly inflated, you can turn on the instrument cluster and navigate through the menu until you find the option that indicates tire pressure: if this screen shows the new values, the light will turn off; otherwise, you will need to drive for a few miles so that the sensors can read the new values and turn off the light afterward.

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by ScegliAuto

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