E-Class (W211) 2003-2009

Is there a warning message when your battery is getting weak?

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Old 01-04-2012, 12:43 PM
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2018 E400 4matic Wagon
Is there a warning message when your battery is getting weak?

Now that my wife's wagon is almost 4 years old and the weather chilly, my wife was asking me if there is a warning message when the battery is getting weak. Or, do you know its weak when it just won't start the car and you're left stranded?
Old 01-04-2012, 02:34 PM
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1991 F-150, 1976 912E, 2006 E500 Wagon
The OE batteries generally last about 7-8 years,

and in this W211 M-B series, the alternator often goes before the batteries (main and auxiliary), but there is a warning for that. I recommend that you do a whole lot of reading about the battery situation among the posts of this site soon.
Old 01-04-2012, 06:44 PM
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2004 E320
Simple check with a voltmeter. 12.45 volts nominal is almost fully charged in this weather.

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