Date registered: Oct 2005
Vehicle: '04 G55 '80 280GE '99 S420 '98 E320 2010 E350(R.I.P) 2011 E350
Location: South Texas
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I have been quite disappointed in the longevity of the batteries in these fobs...
I also, recently had to replace mine, after only 10 months.
Our other MB's keys last years, and years and years....
The downside of a "Keyless Entry", where the fob (i would assume) is "ALWAYS ON", and constantly searching for the vehicle.