How to Replace the Battery in an Older Mercedes SL65 Key?

1 Answers
EliasAnn
07/30/25 3:41am
Method for replacing the battery in an older Mercedes SL65 key: 1. Flip open the tab at the back of the key to remove the mechanical key; 2. Insert the mechanical key into the side slot of the key, press the internal gray button, and with the other hand push the back end of the key upwards. When a gap opens, you can remove the mechanical key; 3. Take out the back end and replace the battery; 4. After installing the new battery, reinsert the key holder, completing the battery replacement. The lifespan of a Mercedes key battery is generally five years. When the key battery is low, the Mercedes vehicle will indicate: 1. When pressing the ignition switch, the dashboard will display a message to replace the key battery; 2. If the indicator light on the key dims or does not light up when pressing the lock or unlock button, the key battery needs to be replaced.
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