S63 AMG 4MATIC Coupe, S65 AMG Coupe (C217), Convert. (A217) 2014 -2021

Aftermarket Battery options

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Old Sep 15, 2025 | 10:03 AM
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Aftermarket Battery options

Is there any aftermarket battery options for these? Mine is probably due at 10 years. Completely dead after 6 months, of what was supposed to be temporary storage while doing house renovations.

Going to throw it on a trickle charger and see whats up.
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Old Sep 15, 2025 | 11:15 AM
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10 years old, and you're living on borrowed time (lol). Any auto store can install a new battery for you. MB buys batteries from the same sources as Autozone, OReilly, Napa, CarQuest, Pep Boys, AdvanceAuto, etc.
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Old Sep 15, 2025 | 02:09 PM
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Unless I am misreading, these have a Lithium Ion battery that lasts between 5-20 years. $2500 at the dealer.

Worked fine before I parked it for 6 months. I have one more year on CPO 5 year warranty so I may be forced to use the Mercedes part. Although the car is now tuned with mid pipes so the warranty is probably trash anyway.

Really want to drive my car!

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Old Sep 15, 2025 | 02:37 PM
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Your opening post neglected to mention lithium, and being somewhat rare in application, I mistakenly assumed your battery is AGM. Sorry about the error. Have your searched the forum on this topic? I think I recall reading about replacing the lithium with AGM and re-coding the battery management system.
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Old Sep 15, 2025 | 02:53 PM
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Originally Posted by streborx
Your opening post neglected to mention lithium, and being somewhat rare in application, I mistakenly assumed your battery is AGM. Sorry about the error. Have your searched the forum on this topic? I think I recall reading about replacing the lithium with AGM and re-coding the battery management system.
This is what a lot of members are doing. BenzNinja offers a re-coding service.
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Old Sep 15, 2025 | 03:03 PM
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I am thinking if I get an aftermarket battery for around $1000 that lasts as long as the stock one did i would just do that.
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Old Sep 15, 2025 | 06:01 PM
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Not sure what price and availability are for a MB OE lithium battery, or what BenzNinja charges for AGM recoding, but the convenience, price and availability of an auto store replacement would justify going AGM for me.
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Old Sep 15, 2025 | 06:16 PM
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Thats true.

Warranty plus lifespan has me leaning lithium.

I am going to run over tonight or early AM to charge it. I want to drive my car.
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Old Sep 15, 2025 | 07:18 PM
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Originally Posted by Guv’nor
Thats true.

Warranty plus lifespan has me leaning lithium.

I am going to run over tonight or early AM to charge it. I want to drive my car.
When my AGM battery died 3 years ago, I was back on the road with a new auto store battery in 90 minutes.
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Old Sep 19, 2025 | 02:46 PM
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So this thing is dead dead. The best jump box wont even get ANYTHING working.

is there an emergency trunk releass?
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Old Sep 19, 2025 | 03:01 PM
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Originally Posted by Guv’nor
So this thing is dead dead. The best jump box wont even get ANYTHING working.

is there an emergency trunk releass?
If there is, instructions are probably in your owners manual (which is probably locked inside your car). Download a copy from MBUSA at https://www.mbusa.com/en/owners/manu...08-c217-comand
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Old Sep 19, 2025 | 05:19 PM
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Can you use the key? There's a metal key connected to the fob.
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Old Sep 19, 2025 | 08:47 PM
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Yes I opened the door and also tried the key in the ignition. Dead as a door knob.

Does the little key fob key open the trunk?
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Old Sep 20, 2025 | 08:22 AM
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You'll need to remove the key from the fob and insert into the lock under the trunk lid.
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Old Oct 15, 2025 | 10:45 AM
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So if this happens to anyone else. If the lithium battery is dead, its fuggin D-E-A-D. You can’t jump or charge it to wake it up.

The emergency trunk release is between the rear seats behind the arm rest. May take 2 people and a set of channel locks.

The new battery from Mercedes is around $2,000. Its a different size, different country of origin. I am still trying to figure out how to properly install it. You need the tray and new style vent adapter.

It also comes without a charge. So I had to charge it. Remember to do that before installing it, luckily I had a voltage meter handy.

No need to program anything. Regardless of what the dash warning says just start it.
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Old Oct 15, 2025 | 10:47 AM
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Also going to install trickle charger wires on it directly and tuck them up so I can charge it when it sits for more than a few weeks at a time. Same parts store kit I installed on my motorcycle.
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Old Oct 15, 2025 | 11:52 AM
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Originally Posted by Guv’nor
So if this happens to anyone else. If the lithium battery is dead, its fuggin D-E-A-D. You can’t jump or charge it to wake it up.

The emergency trunk release is between the rear seats behind the arm rest. May take 2 people and a set of channel locks.

The new battery from Mercedes is around $2,000. Its a different size, different country of origin. I am still trying to figure out how to properly install it. You need the tray and new style vent adapter.

It also comes without a charge. So I had to charge it. Remember to do that before installing it, luckily I had a voltage meter handy.

No need to program anything. Regardless of what the dash warning says just start it.
What are its physical dimensions, and are there capacity specs included on its label (CCAs and/or AHrs)?
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Old Oct 15, 2025 | 01:19 PM
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Let me look I have both. May be a few days. Its still all taken apart.

Just so everyone knows both the “batteries” are in the truck and the secondary one is just a capacitor.

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