2013 R231 Batteries - Mercedes-Benz Forum
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post #1 of 27 (permalink) Old 10-07-2017, 11:44 PM Thread Starter
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Exclamation 2013 R231 Batteries

Hi guys,

After a 2 week vacation, came back to find my 2013 SL350 not cranking.
Would my problem be with the battery in the trunk or the one behind the passenger seat?

Another question, is there a how to/vid... to access the one behind the passenger seat without breaking anything?

Appreciate your quick response.

Thx
Danny
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post #2 of 27 (permalink) Old 10-10-2017, 01:11 AM
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I believe the one in the trunk is the cranking battery. It is much bigger. According to the data I can find they are both AGM.

You should be able to charge both batteries by connecting to the jump start points....but this is only my own assumption.
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post #3 of 27 (permalink) Old 10-10-2017, 02:17 AM Thread Starter
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Originally Posted by Rorywquin View Post
I believe the one in the trunk is the cranking battery. It is much bigger. According to the data I can find they are both AGM.

You should be able to charge both batteries by connecting to the jump start points....but this is only my own assumption.
I have another car which I am using now. Not daring to touch the Merc until I get a strong answer about what to do.

I have the Mercedes Trickle charger, will figure out over the weekend how to use it correctly on the R231.
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post #4 of 27 (permalink) Old 10-11-2017, 12:44 PM
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Originally Posted by Silver_Spear View Post
I have another car which I am using now. Not daring to touch the Merc until I get a strong answer about what to do.

I have the Mercedes Trickle charger, will figure out over the weekend how to use it correctly on the R231.
The MB trickle charger used to be a rebadged CTEK (think they still are). I will be using my CTEK (on the AGM (snowflake) setting) to keep my batteries in good nick during winter. If the system can take the current involved jumpstarting the car, I confident that it will be safe to charge through the jump start points.

Be interested to hear what your findings are - have you called MB service?
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post #5 of 27 (permalink) Old 10-11-2017, 01:21 PM
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From the online manual..................

Charging the battery

Warning

Note

The jump-starting connection point is in the engine compartment.
If the indicator/warning lamps do not light up at low temperatures, it is very likely that the discharged battery has frozen. In this case you may neither jump-start the vehicle nor charge the battery. The service life of a battery that has been thawed may be reduced. The starting characteristics may be impaired, especially at low temperatures. Have the thawed battery checked at a qualified specialist workshop.
Read the battery charger's operating instructions before charging the battery.
Open the bonnet.
Connect the battery charger to the positive terminal and earth point in the same order as when connecting the donor battery in the jump-starting procedure
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post #6 of 27 (permalink) Old 01-18-2018, 02:55 PM
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SL 550 batteries are wired mostly the same as the SL 500 of old.

The rear trunk battery is called the "convenience" battery. It runs everything in the car, except
crank the starter armature, which is the sole job of the engine compartment battery.

With regards to coming home and car won't crank, and the battery could not have been frozen,
it should charge up with a normal battery charger. If the convenience battery then shows it is also
discharged (which is likely because this battery keeps all the computers going when the car sits),
it can be charged enough with a main battery charger to get everything going. Then get yourself a
battery maintenance charger (shuts off when fully charged and comes back on when needed).

I live in central Texas, so the freeze thing is not a problem, but the excessive summer heat is.

When the car idles around in traffic with AC at full blast, radio on, running lights on, etc, the convenience
battery does not hold a full charge just by driving. In addition to that, the convenience battery is always supplying
power to the car computers even when the car sits not running in the garage.

I have a Harbor Freight battery maintenance charger ($20 and it shuts off when fully charged) to maintain the trunk battery
throughout the summer. Have used it over 5 years on the 05 SL500 and now have wired it into the 15 SL550. No problems.
The trunk battery is under the trunk floor. Just pull up the floor, and there it is.

The one question I do not know however, is if the front battery is charged with a maintenance charger on the trunk battery. I have
never had an engine battery fail, except when they just wore out over time. Does anybody know the answer to that?

For you guys up north, or owners who hardly ever drive the car, a battery maintenance charger is an SL necessity, and should have come
with the car. But what do you want for $115,000.00? I don't even have a spare tire on the 15.
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post #7 of 27 (permalink) Old 01-29-2018, 03:18 PM
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Quote:
Originally Posted by gvrbabenz View Post
The one question I do not know however, is if the front battery is charged with a maintenance charger on the trunk battery.
The best information I have is that the charger for the convenience battery doesn't charge the starting battery.

Alan
If it doesn't fit, force it.
If it breaks, it needed replacing anyhow.
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post #8 of 27 (permalink) Old 03-12-2018, 08:06 PM
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Does anybody know the location of the cranking/starter battery ? Not a lot of clarity here. Is it behind the passenger seat in what used to be a stowage box in older sl's buried under a fuse panel and other items?
Is their a procedure for accessing it. Also when connecting a ctek or equiv to the convenience battery does it offer a charge to the starter battery. I understand there is a complex charging system built into the car to keep both batteries charged. Does this also occur without the alternator via the trickle charger? In other words, when connected to a charger via the rear convience battery, does charging also occur on the cranking /starter battery.
THanks
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post #9 of 27 (permalink) Old 03-15-2018, 05:33 PM
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Garage
Since it seems that it is not clear to some of you in regards to a convenience battery & cranking battery, in a R231, I will clarify for you. The R230 car had a cranking/starter battery in the engine compartment and a very large convenience battery in the trunk. The R231 Has two batteries, both in the trunk. They are called, Primary and Auxiliary. The Primary, of course is the main cranking battery, and the auxiliary is for, which makes sense, is to be able to put the transmission in neutral should the main battery go dead and the vehicle requires towing. I suspect the auxiliary battery has a lot more function than I described, like keeping memory in the systems. Open the trunk and remove the cover, then pull out the Air Pump in its holder. At this point you'll finagle the whole piece out that the air pump was sitting in. Then you'll see the main battery. Pretty easy access. This is a far as I've been with mine. By looking at the setup, I believe the small auxiliary battery is behind the main battery under the the foam piece, which can only be removed by taking out the main battery. I cannot attest as to what will happen when both batteries are disconnected, or whether you can simply reinstall them, or does it need to get some kind if reset at the dealer. Be careful, good luck!
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1971 350SL 4-speed stick- sold
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post #10 of 27 (permalink) Old 03-16-2018, 01:32 AM
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Not sure you have it correct. Screen shot from the QR code on my car showing location of batteries for rescue services etc... One in the boot (trunk) one behind the right seat!

[url=https://flic.kr/p/FyvsMH]
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