Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Replace the Key Battery in Your Smart 451

Model: Smart Smart 451 - Years 2007-2015
Part: Key

The steps required to replace the battery in your Smart 451 key are few and simple. Let's discover what they are. First, obtain a standard flat-head screwdriver. Insert it into the lower area of the cover and apply a slight upward force to fully open the cover. Once this is done, locate the exhausted battery and proceed with the actual replacement (ensuring the new battery is compatible with your key model). Finally, reassemble the cover and you're finished.

Updated on 8 July 2026 by ScegliAuto

Video tutorial

Related tutorials

How to Replace the Key Battery on a Smart 451
How to Replace the Key Battery on a Smart 451
Smart (2007-2015 / 451) If the key for your Smart 451 has suddenly stopped working, it is likely that the small button battery inside has completely drained. In this guide, …
Replacing the Key Fob Battery for Smart Fortwo 451
Replacing the Key Fob Battery for Smart Fortwo 451
Smart (2007-2015 / 451) In this video tutorial, you will learn how to disassemble and replace the battery in the remote key fob of a Smart 450 and 451 in simple steps. To do…
Replacing Key Battery on Smart Fortwo 451
Replacing Key Battery on Smart Fortwo 451
Smart (2007-2015 / 451) Today, you will learn how to open the key remote and replace the internal battery of a Smart Fortwo 451; this operation is very simple and does not r…

Other guides you may be interested in

    Frequently Asked Questions

    • Smart 1998-2007 - What to do if the key gets stuck in the Smart? Read answer

How to Replace the Remote Battery for the Volvo XC40?

In this tutorial, you will see how to replace the battery in the remote for the Volvo XC40, a very simple and quick operation. For this, you will need a replacement battery of type CR2032 and possibly a small flathead screwdriver. First, remove the front cover by pressing the button on the metal ring, then locate the second button, press it as well, and remove the opposite cover. Next, open the circular cap, take out the old battery, and insert the new one in the opposite direction. Finally, reassemble everything.

Watch the video!


by ScegliAuto

More videos