Change battery for Remote Key Fob.

DC-IT · 12-25-2011, 09:58 AM

Yesterday the dashboard flashed a warning that my key fob battery needs to be changed.

Rather than get it from Mercedes-Benz I drove to a local computer store and bought a CR2025 (3Volt) button battery cell for only $2.00.

Took less than 10 sec to pop out the old battery and pop in the new one and it's good to go.

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GSD · 12-25-2011, 01:41 PM

Replacement already?

eeferber · 12-25-2011, 04:16 PM

Quote:

Originally Posted by GSD

Replacement already?

yep, me too. Had to change both keys after only 14-15 months. Don't know, but I wonder if keyless start contributes to battery drain?

roadrutz · 12-25-2011, 05:33 PM

Quote:

Originally Posted by eeferber

yep, me too. Had to change both keys after only 14-15 months. Don't know, but I wonder if keyless start contributes to battery drain?

30 months old with keyless start and still on the original batteries.

eeferber · 12-25-2011, 06:47 PM

Quote:

Originally Posted by roadrutz

30 months old with keyless start and still on the original batteries.

Well, guess keyless start isn't the culprit. On my '99ML I believe I changed batteries twice during about 10years of ownership.

It did cross my mind that the "replace battery" display was really triggered by elapsed time from when the car was placed into service just as a preventative measure. I don't have a battery tester for those button batteries so I can't say whether or not it the voltage was actually getting low.

MAmendola · 12-25-2011, 08:14 PM

Had an 06 for 3 years and current have an 09 that I have had for 2 1/2 years. Drive the vehicle daily have never replaced the batteries in either key.

C-rod · 12-25-2011, 10:40 PM

after only 10-11 months, I had to replace them...........I changed them, then within a month, the icon came on again...."replace key battery"....I had the battery checked, full battery power...Go figure..so I replaced them with a better brand CR2025....so far so good............

DC-IT · 12-26-2011, 07:17 AM

Maybe I use the key fob to open the rear tail gate too often thus causing the battery to run low?

In my 335d my key fob's battery is still good after 2 years but there is no auto-trunk opening on the D.

It could be a bad batch of batteries?

The CR2025 is similar to the CR2032 which is used on computer motherboards and these lasts for many years.

12-25-2011, 10:40 PM	#7
C-rod Senior Member Garage is empty, add now Join Date: Dec 2002 Location: Guelph, Ont. CA. Posts: 286 Drives: 2011 ML550 Grand Edition (Chromite Black)	I had the same issue...... after only 10-11 months, I had to replace them...........I changed them, then within a month, the icon came on again...."replace key battery"....I had the battery checked, full battery power...Go figure..so I replaced them with a better brand CR2025....so far so good............ __________________ 1999 ML 430 (126,000 KM'S) Traded-in... 2002 ML 55 (130,000 KM'S) Traded-in... 2006 ML 350 (40,000 KM'S) Stolen... 2006 ML 350 (26,000 KM'S) Traded-in... 2010 ML 350 (Tenorite Grey Metallic) Traded-in... 2011 ML 550 (Chromite Black-Grand Edition)

12-26-2011, 07:17 AM	#8
DC-IT Member 2011 Mercedes-Benz M-Class Join Date: Sep 2009 Location: Toronto, Canada Posts: 173 Drives: 2011 ML350BT Grand Edition, 2011 Jetta TDI and 2010 BMW 335d	Maybe I use the key fob to open the rear tail gate too often thus causing the battery to run low? In my 335d my key fob's battery is still good after 2 years but there is no auto-trunk opening on the D. It could be a bad batch of batteries? The CR2025 is similar to the CR2032 which is used on computer motherboards and these lasts for many years. __________________ *DC-IT*

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12-25-2011, 01:41 PM	#2
GSD Junior Member Garage is empty, add now Join Date: Jul 2011 Location: Ontario, Canada Posts: 35 Drives: 2007 ML320CDI 2004 Jetta TDI	Replacement already?

12-25-2011, 08:14 PM	#6
MAmendola Member Garage is empty, add now Join Date: Dec 2006 Location: Endicott NY Posts: 115 Drives: 09 ML350 4MATIC	Had an 06 for 3 years and current have an 09 that I have had for 2 1/2 years. Drive the vehicle daily have never replaced the batteries in either key.

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