SL/R231: Second Battery?
03-05-2013, 05:29 PM
#26
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2013 SL550, '06 Corvette Convertible
Question for MBtech: In addition to my new SL550, I have an '06 Corvette. I rarely drive eiher in the winter due to all the "gravel" on our Colorado roads. I have used a trickle charge battery maintainer for years on the Vette, as sometimes it's months sitting under cover in the garage. I'm doing the same thing for the SL, attachig the battery maintainer to the positive and negative posts in the engine compartment. I was assuming that both batteries would be maintained using this proceedure, but maybe not. Any thoughts?
03-05-2013, 08:23 PM
#27
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10 speed bicycle
Question for MBtech: In addition to my new SL550, I have an '06 Corvette. I rarely drive eiher in the winter due to all the "gravel" on our Colorado roads. I have used a trickle charge battery maintainer for years on the Vette, as sometimes it's months sitting under cover in the garage. I'm doing the same thing for the SL, attachig the battery maintainer to the positive and negative posts in the engine compartment. I was assuming that both batteries would be maintained using this proceedure, but maybe not. Any thoughts?
01-12-2018, 12:03 PM
#30
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SL550
12-04-2018, 04:20 PM
#32
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sl500, bentley GT, 911 cab, 1947 lincoln continental cabriolet
Close but not exactly. The ECO start/stop battery G1/13 actually only supports active electrical loads during the brief starting sequence when ECO start/stop is active. During this time the main battery, G1, is isolated from the rest of the vehicle to allow full power to the starter armature only. The starter solenoid power still comes from G1/13 in this case. Of course with ECO start/stop the starter is not the only thing used to start the engine.
The 230 dual battery system is quite different. The trunk battery aka systems battery aka G1 provides power to all electrical loads of the vehicle under normal conditions with the exception of the starter armature. The front battery aka starter battery aka G1/4, only provides power to the starter armature, the solenoid for the starter is still powered by G1 under normal circumstances.
Normally these two batteries are completely isolated, only for charging or undervoltage are they linked in parallel by battery cutoff relay K57.
Once again see previous quote, under normal circumstances the starter battery powers ONLY the starter armature.
The 230 dual battery system is quite different. The trunk battery aka systems battery aka G1 provides power to all electrical loads of the vehicle under normal conditions with the exception of the starter armature. The front battery aka starter battery aka G1/4, only provides power to the starter armature, the solenoid for the starter is still powered by G1 under normal circumstances.
Normally these two batteries are completely isolated, only for charging or undervoltage are they linked in parallel by battery cutoff relay K57.
Once again see previous quote, under normal circumstances the starter battery powers ONLY the starter armature.
12-04-2018, 09:56 PM
#33
MBWorld Fanatic!
I'm finding it difficult to follow all the battery opinions. I have an R231 2013 sl550 and battery cranks starter rather slowly. It starts but will not shift from PARK into R or D. If I leave it running for a while a battery must be charging and it will then shift. What battery is controlling that? Both batteries are almost 6 years old
12-05-2018, 06:49 AM
#34
Senior Member
If you received a response to this question, I could not find it. I also would like to put a tender on my 2017 550SL. If I attach a maintainer to the main battery (one to the positive terminal and one to the body frame), in the trunk, will it maintain BOTH batteries or only the trunk battery?
12-05-2018, 08:14 AM
#35
Junior Member
Battery tender
If you received a response to this question, I could not find it. I also would like to put a tender on my 2017 550SL. If I attach a maintainer to the main battery (one to the positive terminal and one to the body frame), in the trunk, will it maintain BOTH batteries or only the trunk battery?
12-05-2018, 09:15 AM
#36
Senior Member
12-05-2018, 12:03 PM
#37
Junior Member
Tenders
I have been using the attached for some time now on a car that I keep at my other house, and it works great.
