SL/R232: SL63 Dead battery issue
Junior Member
Joined: Dec 2017
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From: USA
2023 AMG SL55 Performance, 2023 Audi Q8 Prestige
Newbie
Joined: Dec 2024
Posts: 6
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sl 63 amg 232
La última mia fue el 31/12/25, aquí en España. No sé si es de la que estás hablando pero no he notado nada especial después. Mismos avisos, misma duración de la batería una vez apagada
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Last edited by rogeville; Jan 30, 2026 at 08:02 AM.
MBWorld Fanatic!
Joined: Jan 2013
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From: Irvine, California
2022 AMG SL63
[QUOTE=rogeville;9259057]La última mia fue el 31/12/25, aquí en España. No sé si es de la que estás hablando pero no he notado nada especial después. Mismos avisos, misma duración de la batería una vez apagada
¡Caballero! Lo siento
¡Caballero! Lo siento
Member
Joined: Oct 2017
Posts: 217
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From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
I just dropped mine off this morning. I drove it 45 minutes home from the Porsche Dealership on Friday, put it in the garage and put one of my Noco chargers on it until it measured a full charge. It took 11 hours (this is with the keys in a faraday box) for it to send a critical battery notice to me through the app. As this is Mercedes # 72 and car # 489 I have dealt with all sorts of issues (when I own 20-25 cars at a time trickle chargers are part of life), but this is a new one for me (I once owned a Triumph Spitfire that shut down every time you turned on the headlights part of the charm of owning British Roadsters), and while I was aware of this issue before I bought the car, I did not expect it would drain that quickly. The battery is going to need to be replaced as well as updates, and recalls that were never done. The previous owner took good care of the car (it has PPF almost everywhere), appearance wise, but apparently did not bring it in for the recalls or the updates it required. I'm a senior citizen these days but I used to build one off cars (one of them sits in my garage now also on a charger), and my tolerance for things going wrong with cars is probably higher than most people's. With that in mind, a car that can only be sitting without a charger for 11 hours is a lot even for me. I'm hoping the software updates and a new battery will eliminate the issue. I'm used to cars that drain down their batteries in a few days, and I'm okay with that, a few hours, that's a whole different situation.
Member
Joined: Feb 2024
Posts: 90
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2023 SL63 + 2021 Cayenne e-hybrid
I just dropped mine off this morning. I drove it 45 minutes home from the Porsche Dealership on Friday, put it in the garage and put one of my Noco chargers on it until it measured a full charge. It took 11 hours (this is with the keys in a faraday box) for it to send a critical battery notice to me through the app. As this is Mercedes # 72 and car # 489 I have dealt with all sorts of issues (when I own 20-25 cars at a time trickle chargers are part of life), but this is a new one for me (I once owned a Triumph Spitfire that shut down every time you turned on the headlights part of the charm of owning British Roadsters), and while I was aware of this issue before I bought the car, I did not expect it would drain that quickly. The battery is going to need to be replaced as well as updates, and recalls that were never done. The previous owner took good care of the car (it has PPF almost everywhere), appearance wise, but apparently did not bring it in for the recalls or the updates it required. I'm a senior citizen these days but I used to build one off cars (one of them sits in my garage now also on a charger), and my tolerance for things going wrong with cars is probably higher than most people's. With that in mind, a car that can only be sitting without a charger for 11 hours is a lot even for me. I'm hoping the software updates and a new battery will eliminate the issue. I'm used to cars that drain down their batteries in a few days, and I'm okay with that, a few hours, that's a whole different situation.
Last edited by khiroshima; Feb 4, 2026 at 12:48 PM.
Member
Joined: Oct 2017
Posts: 217
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From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
Thanks, fortunately I have bought many vehicles from this dealership and my oldest friend is one of the managers, so I know it will be taken care off. At least they gave me a new loaner so I can play with the MBUX in it. Even though I have owned a lot of MB's this is the first one with this type of MBUX.
Newbie
Joined: Dec 2024
Posts: 6
Likes: 1
sl 63 amg 232
Battery charger
Definitivamente hay algo mal con los cargadores y el software del coche.
Acabo de conectar el cargador con la batería llena (sin advertencias). Después de dos horas de carga,
llegó una advertencia de nivel crítico de batería a la aplicación Mercedes... Supongo que mañana por la mañana estará
llena de nuevo, incluso sabiendo que la advertencia no era precisa en absoluto. Algo está engañando al software tan pronto como se conecta la fuente de alimentación externa... veremos qué pasa mañana
...
Acabo de conectar el cargador con la batería llena (sin advertencias). Después de dos horas de carga,
llegó una advertencia de nivel crítico de batería a la aplicación Mercedes... Supongo que mañana por la mañana estará
llena de nuevo, incluso sabiendo que la advertencia no era precisa en absoluto. Algo está engañando al software tan pronto como se conecta la fuente de alimentación externa... veremos qué pasa mañana
...
Last edited by rogeville; Feb 9, 2026 at 05:55 PM.
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MBWorld Fanatic!
Joined: Jan 2013
Posts: 1,170
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From: Irvine, California
2022 AMG SL63
Es un "trickle charger" y quiere decir que da un poco a poco despaciemente. Puede tomar 12-24 horas para llenar totalmente. Y después cuando se puede conecta el cargador cuando no se usa el coche y déjala de vez en cuando.
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Joined: May 2004
Posts: 85
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From: New Zealand
2023 SL63
Just received that update yesterday here in New Zealand so thought I would take the car for a drive as requested by the update, get in the car and have the warning that speed is restricted as its parked in the garage, click that and it slowly releases the brakes so I can drive out of the garage, get out of the garage and put the soft top down, drive off and its says to fully lower or raise the soft top, slightly raise and then lower the soft top but the warning message goes to red and the chime is incessant, turn around and put the car back in the garage.
Just got a phone message to say the update was successful but who knows what is going to happen next time I lower the soft top, really frustrated with the car.
After 6 weeks in the Mercedes Service centre for the battery saying its Critical within a day its now lasting about 2 weeks before I receive the Battery Critical message.
Just got a phone message to say the update was successful but who knows what is going to happen next time I lower the soft top, really frustrated with the car.
After 6 weeks in the Mercedes Service centre for the battery saying its Critical within a day its now lasting about 2 weeks before I receive the Battery Critical message.
MBWorld Fanatic!
Joined: Jan 2013
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From: Irvine, California
2022 AMG SL63
My experience with the top not being fully raised or lowered is the same as yours. You'll get used to doing it right and then it'll be easy. You just released it too soon or a little too late. When you hear the chime that's when you let go the button.
Member
Joined: May 2004
Posts: 85
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From: New Zealand
2023 SL63
It has worked fine before but not today.
Member
Joined: Oct 2017
Posts: 217
Likes: 95
From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
I went by the dealership yesterday and so far they cannot find what is draining the battery. They showed me the cars history, it has gone through two battery changes (the previous owner was even given a trickle charger) so far. They have done the updates, but it seems there is still something causing the drain. I am going to search through here but if anyone had issues (other than the updates) that caused this and a solution was found, I would really appreciate it if you would let me know. They have now had the car longer than I have, and I do want to keep it so I'm hoping they can figure out what is causing this. Thanks
Member
Joined: Oct 2017
Posts: 217
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From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
I just heard from the dealership, they are replacing the battery once again and then will do parasitic drain test. I have sent them every issue I can find on here that might cause the drain. I know some of you have gotten rid of the car because of this and maybe it's because I am an old guy or maybe because I am too damn stubborn to give up, but I'm going to do whatever I can to help them fix this thing, it is a nice complement to my one of a kind 911 (it's nickname is the widow maker) which is not for the faint of heart. I have not even really had the chance to put it through its paces and see what it can really do. Honestly I'd be fine if it could go just a week of the charger (many of my exotics would not be able to last any longer), which is far better than 11 hours and 5 minutes.
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Joined: Sep 2008
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Lexus IS350
Hello there, I've been reading through this thread because I am considering purchasing a preowned SL63.
coming from a few 911s. I have a GT3 Touring now and a 2020 Audi R8. They are both incredibly reliable, but I miss my 911 Targa and thought an SL63 would be a great option.
should I be nervous considering this issue seems very widespread?
has anyone just considered swapping in an antigravity battery?
coming from a few 911s. I have a GT3 Touring now and a 2020 Audi R8. They are both incredibly reliable, but I miss my 911 Targa and thought an SL63 would be a great option.
should I be nervous considering this issue seems very widespread?
has anyone just considered swapping in an antigravity battery?
Last edited by 2 SIICKK; Feb 19, 2026 at 01:36 AM.
Member
Joined: Oct 2017
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From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
My car is back in the garage, and they solved the battery drainage issue. Yes the car is now on its third battery, but the car never had any of the updates done. If they had been done by the prior owner I may not have had the chance to buy since that was the reason he traded it in. I don't think changing the type of battery would make much of a difference since the issue is not really the battery it's related to the programming in the car. I'm a Porsche guy myself (48 years of owning at least one I'm on number 45) and have a 1 of a kind 911 that is parked right next the the SL in my garage. These cars are very different from a 911 in my opinion (I had a 2016 GTS which was like a German Muscle Car), the steering is not a precise, and it does not have much feedback. It might ride better than GT3, but in the sport modes the ride is more harsh the a regular 911 with its standard suspension. To me the normal 992's feel more the GT cars than the SL does. I bought mine for just about half its original sticker price, hard to pass up at that price.
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From: 🇨🇦
W463 G550 / C190 GTC //prev: W204 C63 507 / R170
That hood open warning is a royal pain.
To prevent it, you must wait to close the hood AFTER you put the car in accessory mode(by pushing engine start switch WITHOUT the brake pedal depressed).
It is even better to wait to close the hood AFTER you start the car.
That’s because sometimes in accessory mode, hood closing doesn’t always register.
To prevent it, you must wait to close the hood AFTER you put the car in accessory mode(by pushing engine start switch WITHOUT the brake pedal depressed).
It is even better to wait to close the hood AFTER you start the car.
That’s because sometimes in accessory mode, hood closing doesn’t always register.
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Joined: Jan 2013
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From: Irvine, California
2022 AMG SL63
No, not by default. Although there is an option, if I'm not mistaken, that can be added at the time of order and puts that 12 V socket in the trunk as well as some power accessory, but I don't remember what it is… But I believe it is specific to the trunk. And, to use the trickle charger with the SL one cannot plug the trickle charger into a 12 V socket. You are warned against that. Instead, you plug the charger onto two specific connections under the hood at the right front. And the car need not be in accessory mode. When I have done it, the car has always been shut off completely while the trickle charger is doing its job.
