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How to Replace the Key Battery in the Mercedes SL Roadster R129

Model: Mercedes Sl MK 5, R129 - Years 1989-2001
Part: Key

Inside the key of your Mercedes SL Roadster R129, there are four small button batteries. However, replacing them is quite simple and quick. Let's see how to do it. First, remove the back cover to gain access to the batteries. Next, take out the old batteries and proceed with the actual replacement by installing the new batteries. Once done, reattach the back cover correctly, and you're finished. Finally, test the key to ensure it works.

Updated on 28 May 2026 by ScegliAuto

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