E-Class (W212) 2010 - 2016: E 350, E 550

How long does fob battery last?

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Old 08-19-2016, 09:59 AM
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Have two with keyless go and the batteries last about a year. Slightly less on the SLK as I use the key fob to activate the vario roof. As in many things battery quality makes a difference.
Old 08-21-2016, 01:31 PM
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2010 E550
Originally Posted by ljoeurban
I was getting 3-6 months on key fob batteries with KEYLESS-GO. Dealer said keep key fobs away from each other. If kept close to each other they talk to each other and run down.

(Forgot when this was.)
How close is "close?"
Old 08-22-2016, 07:39 AM
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how about the TSB L180.35-P-063677 ? This is ties to "replace key battery" warning
Old 08-31-2016, 01:05 PM
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Originally Posted by thenew3
Yes, I've used several different CR2032's and they more than double the life of the CR2025.

They are a little snug and do require some work to take out, but other than that they work fine.


I just bought a CR2032 and it did not fit in my 2014 fob, I tried forcing it in but no luck.
Old 08-31-2016, 01:23 PM
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Here's a picture of the CR2032 in my 2013 key fob.



Unless they changed the 2014 key fob, I don't see why it won't fit.

I also tried the CR2032 in a 2011 C300 key fob, fit and worked fine as well.
Old 08-31-2016, 03:11 PM
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Originally Posted by thenew3
Here's a picture of the CR2032 in my 2013 key fob.

Unless they changed the 2014 key fob, I don't see why it won't fit.

I also tried the CR2032 in a 2011 C300 key fob, fit and worked fine as well.


My fob looks the same, is there a certain way I have to put it in. I insert the battery right side first, then try to put in the left side down and in but it will not clear the battery housing. I am using an energizer CR2032 battery.
Old 08-31-2016, 03:25 PM
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I just insert the right side under the little ridge, then push gently on the left and it just clicks into place. to take out, I use a small flat blade screw driver and stick it in the opening on the top/bottom of the battery and gently twist and the battery pops out.
Old 08-31-2016, 05:52 PM
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Originally Posted by thenew3
I just insert the right side under the little ridge, then push gently on the left and it just clicks into place. to take out, I use a small flat blade screw driver and stick it in the opening on the top/bottom of the battery and gently twist and the battery pops out.


I just try to put the CR2023 in again, not even close to fitting in there. Just wonder, do you have keyless go? I am guessing the internal of the fobs are different.
Old 08-31-2016, 05:53 PM
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Originally Posted by The G Man
I just try to put the CR2023 in again, not even close to fitting in there. Just wonder, do you have keyless go? I am guessing the internal of the fobs are different.
Yes I have keyless go on the 2013 E350, but no keyless go on the parents 2011 C300

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