DIY: Smartkey Battery Replacement - Page 2

Jun 9, 2015, 07:26 PM

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Mercedes-Benz C-Class: How to Replace SmartKey Battery
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Feb 18, 2020 | 08:12 PM

#26

ERA

Newbie

Joined: Feb 2020

Posts: 5

Likes: 0

C300 2008

Quote:

Originally Posted by LILBENZ230

No, programming is not erased. You can start a Mercedes with the key fob even without the battery in it.

thanks for your advice. I was doble checking because I went to the battery store and they told me that.

Oct 24, 2025 | 11:42 AM

#27

AngusAranda

Newbie

Joined: Oct 2025

Posts: 7

Likes: 0

2011 W204 C300

My key is slightly different. I can't take out the inner guts and my battery is located behind a plastic cover that pops off when you insert the valet key into a side channel within the key fob.

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