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How to Replace the Key Battery for a Mercedes-Benz

Model: Mercedes Mercedes Various
Part: Key

This guide explains how to replace the battery in the electronic key for various Mercedes-Benz car models. Follow these steps: 1. Extract the mechanical part of the key using the designated button; 2. Remove the snap-on plastic part indicated by the engraved design on the plastic itself. No excessive force is needed; just apply a little leverage; 3. Remove the plastic part along with the seal that holds the battery in place; 4. Extract the old battery and replace it with the new one. It is also important to ensure that the voltages of both batteries are identical; 5. Reassemble the key by reversing the previous steps.

Updated on 23 May 2026 by ScegliAuto

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