I purchased a used 2013 SL550 (R231) this spring, and with winter fast approaching, am now looking at putting it into storage.
I'm trying to determine the best procedure for doing so in terms of the batteries, and my research is turning up conflicting information.
From what I've been able to determine, the R231 does indeed have two batteries, however there appears to be a large difference between the location/function of the dual batteries in the R231 versus the R230. I have been able to locate the main battery in the trunk, but can't seem to find the secondary battery. I've seen conflicting posts on this forum as to the location of the secondary battery - one post indicating it was located behind the passenger seat, and another suggesting it was beside the main battery, but possibly only accessible after removing the main battery (which I have not yet done).
Based on that, I have several questions and am hoping that someone here can provide some definitive answers.
1) Where is the secondary battery in an R231 located?
2) What is the function of the secondary battery in the R231?
3) If I were to connect a battery maintainer / trickle charger, should the connection be made at the main battery, or via the jump start points under the hood?
4) If I were to remove the main battery, are there any issues with being able to manually close and open the automatic trunk with no power available?
5) If the main battery were to be removed for the winter, are there any other things I'd need to be concerned with in the spring?
I live in an extremely cold climate, with several weeks of -30C temps during the winter, so it's very important for me to make sure that I take the appropriate steps to protect the battery(s).
Any clarification on these items would be greatly appreciated.
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