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How to Replace the Key Battery of a Smart Fortwo

Model: Smart Smart 451 - Years: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
Part: Key

See other generations:
Video tutorial

How to replace the key battery of a Smart Fortwo? Follow these steps: take your ignition key and use a screwdriver to lever between the two plastic halves until they separate. Remove the flat battery (using the screwdriver) and take a new one of the same size and voltage.

Refit the two parts of the key fob cover until you hear them click into place. Check the key fob's functionality by testing the door lock and unlock buttons.


Updated on 8 March 2026 by ScegliAuto


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