M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Auxiary battery

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Old 12-06-2016, 07:54 PM
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Auxiary battery

The white battery visit workshop is on. I wonder if that auxiliary battery being low can cause transmission not to shift. I read few post stating that auxiliary battery was bad and car would not shift.
Old 12-06-2016, 10:59 PM
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2008 ML320 CDI
Originally Posted by tritron
The white battery visit workshop is on. I wonder if that auxiliary battery being low can cause transmission not to shift. I read few post stating that auxiliary battery was bad and car would not shift.
I have the same warning coming up on an ML320 cdi. I'm thinking about replacing the main battery anyway because I know it's been in there at least 3 years but I remember I had a friend with an E55 that had an aux battery that he had to replace.

I know the E55 AMG and the ML 320 are worlds apart but I was wondering if I didn't have one of those aux batteries, and if I need to replace that as well.

I was also told that a battery warning light could mean a failing, or failed alternator. I don't think that's my problem because the car starts, and runs fine. The mechanic who told me this was thinking "old school", American cars I think.

Let me know when you find out what fixes it. I'll be interested to hear!
Old 12-06-2016, 11:42 PM
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From reading this forum white battery warning is auxiliary battery and red is main battery.
When engine is running voltage is 13.8V The car revs high and will not shift. Is that due to bad battery or conductor plate?
Old 12-08-2016, 02:27 PM
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I found out that battery plus sells Duracell battery for ML350 cost only $20.
Old 12-21-2016, 02:47 PM
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Tritron - where can you get that battery for $20?
Old 12-21-2016, 09:55 PM
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2008 ML320 CDI
Originally Posted by ml3204me
Tritron - where can you get that battery for $20?
It's not an OEM battery but I have seen other options available for as little as $7-$10. They might not be an exact fit, and some have complained about the terminals being reversed but there are aftermarket options available.


DISCLAIMER: I am NOT recommending this part for anyone's specific vehicle. I'm just showing it as an example. Please check compatibility before ordering anything.

https://www.amazon.com/1-3Ah-Battery.../dp/B00K899IK6
Old 12-22-2016, 04:23 AM
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ML 320 CDI ''06
Hello! I apologize for my English. I changed the battery 2 years ago with one not ОЕМ, but Chinese and have no problem with that. Battery cost 5$. The only important parameters of battery 12V 1,3 Ah


Old 12-22-2016, 08:22 AM
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Originally Posted by ml3204me
Tritron - where can you get that battery for $20?
I got this bateery https://www.batteriesplus.com/batter...iliary?q=ml350

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