In Mercedes E300 model 2010. What is the function of Auxiliary battery?What is the difference between aux battery and main batter on my car??

30

Asked by Sharif_alameer Jul 20, 2013 at 12:21 PM about the 2010 Mercedes-Benz E-Class

Question type: Maintenance & Repair

In Mercedes Benz E300 want is the function of auxiliary battery?.
What is the difference between main battery and auxiliary battery?.
Where  is the location of auxiliary battery and main battery on the car?.

14 Answers

201,255

http://m.youtube.com/watch?v=neVPZnHAF_w&feature=relmfu

12 people found this helpful.
201,255

The last two posts is the best videos I could find. The first one is for your large battery in the trunk spare tire area. (www.youtube.com/watch?v=Jak7xKCYOq0). The second one is for you smaller one for the SBC. I believe this is the one giving you the issues. (http://m.youtube.com/watch?v=neVPZnHAF_w&feature=relmfu ). Hope this helps

14 people found this helpful.
16,195

Battery in engine bay is only for starting. All other electrical functions of the car are handled by the auxiliary battery in the trunk.

19 people found this helpful.
620

How to change the auxiliary battery malfunction Mercedes e300

62 people found this helpful.
250

E250. How to change battery malfuntion

25 people found this helpful.
100

Thought this was a big deal. Got "Auxiliary Battery Malfunction" on my dash yesterday. Today, in addition, there was a message that read "Change Key Battery." Brought the car into dealer & service advisor said bring the key to the cashier. In less than one minute, the cashier changed the battery at no charge & gave me back the key. When I started the car both messages disappeared & I was on my way. Very simple solution.

10 people found this helpful.

The same thing happen to me, with my GLK, I when and got my battery change then complain about the message that show up so they told me 210$ to change the the battery which they could not explain what is the function of the auxiliary battery , but as soon as I return to car all notice disappeared. So I can cancel my 210$ appointment. All I need to do was change the battery in the remote.

280

bobkat's answer is off. The main battery in both videos are in the truck. And the aux battery is in the engine bay, under cover. So what is the function of the aux battery and why is it necessary? The auxiliary battery exists for safety concern. Say there is a faulty alternator that won't charge. Eventually, the main battery drains and quit. In older cars this is not a problem and most likely, you can still brake to a stop. In newer ones with ABS, ALS, EBRAKE, etc. The brakes are electronically controlled. Therefore, if there is no electricity, there is no braking. The aux battery takes over when the main battery fails. Most newer german cars have this feature. Hope this answer helps.

1 people found this helpful.

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