Greetings,
In order to maintain charged batteries during the winter months do I need to attach a trickle charger to EACH of my 2007 E550 4Matic's batteries, or will a charge applied to just the main battery also flow to the auxillary battery?

Thanks for your guidance!

maico490

 

If the car is driven even infrequently you should not need a trickle charger at all

 

I only have one maintainer hooked up to the main battery. My car will be 6 years old in March of 2010 and I still have the original batteries. I don't know if the aux. battery is at all linked to the main one, but I figured that the main one is a bit more important to keep topped off.

Steve

 

If you have a MY2007 W211, it would not have more than a single battery. The main battery at the trunk.

 

Yes, its a model year 2007. I had never actually checked to see if it had a 2nd battery, but had simply assumed so based upon my readings in these forums.

Thanks for the clarification!