How to Replace the Key Battery for the New Mercedes-Benz E220-CD?

[SanCamilla]

First, push the marked switch upwards to remove the mechanical key, then open the key casing, pry out the old battery, and replace it with a new one. Here are the relevant details: 1. Before replacement, it's best to check the model of the car key battery, which is usually listed in the vehicle's user manual, and then select a new key battery according to the specified model. From the tail of the key, push the marked switch upwards, and the hidden mechanical key will pop out slightly, allowing you to remove the mechanical key. 2. Still at the tail of the key, use the mechanical key you just removed to press against the marked position, apply a little force, and the key casing will open. Once the key casing is removed, you can see the battery located deep inside. Simply insert an object into the gap on either side, gently pry, and the old battery can be removed.