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How to Replace the Key Battery in the Smart 452

Model: Smart Smart Roadster, 452 - Years 2003-2005
Part: Key

In this new mini guide, we will explain in detail how to correctly replace the button battery located inside the key of your Smart 452. It will only take a few seconds to complete the entire operation. First, obtain a flat-head screwdriver and use it to fully open the cover. Once done, you will finally have access to the exhausted battery. Simply remove it and replace it with a new, perfectly compatible one. Finally, close the cover and test the key's functionality.

Updated on 18 May 2026 by ScegliAuto

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