Tutorial on Replacing the Battery in an Old Mercedes ML55 Key
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Tutorial on replacing the battery in an old Mercedes ML55 key is as follows: 1. Press the button on the top of the remote key to remove the mechanical key. 2. Insert the mechanical key into the slot and gently tap it upwards. 3. At this point, the seam of the remote key will slightly open; use the mechanical key to slide downward along this gap. 4. Place the new battery into the battery slot. 5. Finally, snap the separated battery cover back into place. Note: Before replacement, it is advisable to check the battery model for your car key, which is usually specified in the vehicle's user manual, and then select a new key battery according to the specified model.