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Auxiliary Battery

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Old Jul 20, 2025 | 11:29 PM
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Barry Hanna's Avatar
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'15 E350, '20 S560
Auxiliary Battery
Are you registering your auxiliary battery in a face-lifted W222? Does iCarsoft MB Ver 2.0 have that capability?
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Old Jul 21, 2025 | 08:38 AM
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One of them there S cars
Don't think the Aux battery has to be coded. just the main battery.
Might have to resync windows / roof / trunk monkey (if car came with trunk monkey option, but that was a very rare option).
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Old Jul 21, 2025 | 10:34 AM
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Don't think the main battery gets coded either. Lots of threads on battery replacement and don't remember comments about getting it coded. Replace and done.
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Old Jul 21, 2025 | 10:40 AM
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One of them there S cars
You're correct, I was thinking Lithium to AGM conversion.
It was early morning and haven't had coffee, yet.
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Old Jul 21, 2025 | 03:34 PM
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I changed the aux battery by myself, no need on any coding.
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Old Jul 21, 2025 | 05:24 PM
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2019 S560, 2015 Honda Civic Hybrid
I replaced main and aux batteries on both my S-class cars and never coded.

Assumption is the benefit of coding, if any, might be how long the new battery lasts. Since I could buy another battery for what it would cost to code it didn't make sense to me to pursue it ...
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Old Jul 22, 2025 | 12:02 AM
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Aux does not need to be coded no, starter 12v battery coding is optional, coding really just tells the SAM it is a new battery so it doesn't charge it in a way that it was a bad or old battery, apparently registering to SAM prolong the life of the new battery.
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Old Jul 22, 2025 | 12:03 AM
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Battery coding tells the SAM it's new, so it charges properly, extending battery life. It's optional but recommended. No coding needed for aux batteries.
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Old Jul 22, 2025 | 04:09 PM
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Thanks for all the insight!
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Old Jul 23, 2025 | 03:41 PM
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Originally Posted by Digital Oxygen
You're correct, I was thinking Lithium to AGM conversion.
It was early morning and haven't had coffee, yet.
No, it is highly recommended to code in a new main battery, this tells the ECU to discard the algorithms for the old battery and will help the new battery last much longer
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Old Jul 24, 2025 | 12:36 AM
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Originally Posted by pierrejoliat
No, it is highly recommended to code in a new main battery, this tells the ECU to discard the algorithms for the old battery and will help the new battery last much longer
In that case just get the Launch CReader and register to SAM, way cheaper than the XENTRY suite especially if you have no need for it: https://mbworld.org/forums/e-class-w...onal-more.html
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Old Jul 24, 2025 | 07:11 AM
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Just for anyone reading this and wondering if they need to code in their new battery, this only applies to MY 2016+



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Old Jul 24, 2025 | 01:10 PM
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Originally Posted by W205C43PFL
In that case just get the Launch CReader and register to SAM, way cheaper than the XENTRY suite especially if you have no need for it: https://mbworld.org/forums/e-class-w...onal-more.html
That works, My ICARSOFT MB does also, But there are better choices now I think
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Old Jul 24, 2025 | 10:02 PM
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Originally Posted by pierrejoliat
That works, My ICARSOFT MB does also, But there are better choices now I think
Ya I heard the Launch is cheaper and has more features than the icarsoft.
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Old Jul 24, 2025 | 10:34 PM
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‘68 Pontiac convertible, ‘71 Corvette 4 spd, ‘20 Accord Touring, 06 Duramax crew-c
What is a “trunk monkey?”
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Old Jul 25, 2025 | 08:58 AM
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Originally Posted by MrMischief
What is a “trunk monkey?”
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Old Jul 25, 2025 | 01:38 PM
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Currently ‘2015 S550 4matic. Previously 03 E320, ‘06 S430, ‘08 S550 4matic
Ha! You made me look!
googled Mercedes Trunk Monkey.
Well played Digital Oxygen, well played
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Old Jul 26, 2025 | 01:18 PM
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Oh yeah, I completely forgot about those commercials on TV!
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Old Jul 26, 2025 | 09:45 PM
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Originally Posted by dmatre
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Old Jul 26, 2025 | 09:53 PM
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and I thought trunk monkey meant "monkey wrench in things" as in a monkey in the back causing trouble : )
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