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What seems strange to me is I have 2 2019 e450s one a wagon and one a Cabriolet. The wagon is fine. I can park it for 3 weeks no charger and the app will say partly charged battery. The cabriolet after 3 to 7 days will be getting a battery critical message on the app. I still think it’s software related but I’ll have dealer check it out soon.
thats interesting. What options differ between the two?
The Wagon does come STD with the rear Air suspension although not up front, I hardly ever hear the pump run. With my 2018 AMG wagon I use to hear it running a lot. The Cabriolet does have a few extra options over the wagon, the mulitcontour seats/ventilated. The heads up display, leather int. other than that not much of a difference. The Cabrio has no Air suspension. It does seem like with the cabriolet after it's turned off I do hear the int. fan coming on and off a lot whereas I don't really notice it with the wagon, maybe thats the difference and accounts for the battery drain. Both cars have the same V6 Twin turbo motor with the 9 speed auto.
I was thinking about it, I guess the main reason I have issues with the Cabriolet going Critical low charge is it sits around a lot more than my wagon. The Cabriolet only has 8800 miles on it after a year and 2 months. The Wagon same age has 22K miles on it. I have the Cabriolet on the Maintainer right now as it went low again after sitting 4 days or so and it does not get the long trips the wagon gets.
I suppose it would be possible to take the quick connector with the maintainer and connect it to the terminals under the hood and extend the cord and then zip tie it somewhere under the grill and keep the cap on it when not in use and connect to it when parked in the garage. Just don't forget to disconnect it when you go and drive away in the morning. Connecting to a maintainer every night would probably greatly extend battery life.
I suppose it would be possible to take the quick connector with the maintainer and connect it to the terminals under the hood and extend the cord and then zip tie it somewhere under the grill and keep the cap on it when not in use and connect to it when parked in the garage. Just don't forget to disconnect it when you go and drive away in the morning. Connecting to a maintainer every night would probably greatly extend battery life.
I used to keep my Porsche Turbo on a battery tender and did exactly that--ran the cable from the battery thru the grill--and yes on more than one occasion I pulled out of the garage forgetting that it was connected. Luckily most times the sae connector simply unconnected. Twice the battery tender was pulled off the shelf it was on but it didn't break--my garage is carpeted with old carpet from one of my rooms in the house that was replaced with new carpet--sounds crazy but carpeting your garage with carpet you do not care about is great especially in the winter when going into the garage without shoes. That said, now when I hook up my E63s to my NOCO charger/tender I lift the hood so the same thing re forgetting that the tender is hooked up won't happen again
Ya probably the safest idea just leaving the hood open although to do that on a regular basis gets old after a while. I’m thinking just fully charging the battery in my Cabriolet like once a month or so should be adequate. During other times not going to let the battery critical message bother me too much. I would estimate critical comes up at about a 40 or 50 percent charge. Being that the battery is only being fully charged to 80 percent even after an hour of highway driving that is only a 30 percent margin or so. I really think the mb critical terminology is too strong. It should say 50 percent charge and then say critical at like 20 percent or so. Just my opinion.
Was curious if we get any warning messages if our battery is running low? Its winter and its a common time for batteries to die out. I had a few start up where it didn't start on the first try. But no warning message?
Was curious if we get any warning messages if our battery is running low? Its winter and its a common time for batteries to die out. I had a few start up where it didn't start on the first try. But no warning message?
yes, me connect will send you a message “battery is at critical level”…
one can monitor battery using this app, there are three levels:
fully charged, partially charged and critical
example below
Was curious if we get any warning messages if our battery is running low? Its winter and its a common time for batteries to die out. I had a few start up where it didn't start on the first try. But no warning message?
signs of electronics malfunctioning messages. Lit up like a X'mas tree. LOL.
I had:
- electronic rear axle diff lock inoperative
- Active Brake Assist functions limited
- Blind spot Assist inoperative
- No ESP assistance
- Adaptive Highbeam Assist inoperative
You also get the battery icon every time you start up the car.
On the accessory mode (without the engine being started), car will turn itself off after about 4-5 minutes time.
My battery was 4 yrs old and it has just been replaced after having the dealer checked over (all those above issues) and confirmed the battery has fault and in need of replacement.
Last edited by bobblehead; Oct 9, 2021 at 08:48 AM.
Hi all, reviving this thread as I've been having battery concerns. For my past couple drives, I've been getting the "12V battery low" warning as soon as I turn off the engine at the end of the drive. So far, I've noticed no issues operating the car: no warning lights, no issues starting, no weird electrical behavior. But, having the warning pop up AFTER driving for a while strikes me as odd. Thoughts on this?
Some potentially relevant info / history:
- the battery was replaced less than 2 years ago, if the date written in sharpie on the battery is to be believed
- I accidentally ran down the battery completely (all electronics dead, had to jump it) when the car was first delivered (about 5 months ago), in process of changing out all the air filters (probably a combo of the car sitting at the dealership for a good while, then starting the car several times just to move it around the garage once it arrived, and then keeping the doors open and interior lights on to help with the filter change)
- since then, I've gotten the low 12V warning occasionally after the car has sat for a while, but never after the car was just driven. Given what I've read in this forum, that's not unexpected.
- I bought a trickle charger and have charged back up whenever the low warning appears
Check the battery voltage.
Check the voltage when car is running to see if alternator is working.
Replace the battery like the car is subtly trying to tell you.
@taphil with the solution. Old battery was at only 12.1V despite sitting on the trickle charger for several days. Jumped up to 14.7V after starting the car, proving the alternator is fine. Swapped in a new battery, no low warnings for over a week now. It was surprising to me that a less than 2 year old battery would already be toast, but that seems to have been the case!
Some of this depends on the type of battery that you have. If you have the LiPo battery, it has built in battery management and other things that constantly monitor the battery. It is also exponentially more expensive. I have the LiPo battery in my S63 and I was quoted around 3K to replace it. They tested it at the time and determined that the alternator was bad after 5 years but the battery was fine. A LiPo battery should also last at least 10 years according to the battery manufacturer of this battery. AGM is a different story and I would routinely change these out every 5 years or so as you can get one for a few hundred bucks. Pros and cons to both types of batteries but I will probably convert over to AGM if and when my battery dies. This will require some coding as the AGM batteries do not have a BMS feed like the LiPo units have.
Some of this depends on the type of battery that you have. If you have the LiPo battery, it has built in battery management and other things that constantly monitor the battery. It is also exponentially more expensive. I have the LiPo battery in my S63 and I was quoted around 3K to replace it. They tested it at the time and determined that the alternator was bad after 5 years but the battery was fine. A LiPo battery should also last at least 10 years according to the battery manufacturer of this battery. AGM is a different story and I would routinely change these out every 5 years or so as you can get one for a few hundred bucks. Pros and cons to both types of batteries but I will probably convert over to AGM if and when my battery dies. This will require some coding as the AGM batteries do not have a BMS feed like the LiPo units have.
E63 has AGM battery.
Can die if depleted completely. Happened to me once in the first year..
Some of this depends on the type of battery that you have. If you have the LiPo battery, it has built in battery management and other things that constantly monitor the battery. It is also exponentially more expensive. I have the LiPo battery in my S63 and I was quoted around 3K to replace it. They tested it at the time and determined that the alternator was bad after 5 years but the battery was fine. A LiPo battery should also last at least 10 years according to the battery manufacturer of this battery. AGM is a different story and I would routinely change these out every 5 years or so as you can get one for a few hundred bucks. Pros and cons to both types of batteries but I will probably convert over to AGM if and when my battery dies. This will require some coding as the AGM batteries do not have a BMS feed like the LiPo units have.
So nuts. $3,000 battery to save 20 pounds. In a 5,000-pound car.
So nuts. $3,000 battery to save 20 pounds. In a 5,000-pound car.
Haha +1
I bought an Antigravity lithium battery for my W212 as part of a weight-savings vision quest.
Made zero difference in ET or MPH. Along with the CCB's I swapped in, also made no difference in ET or MPH.
I had big dreams.
Nope.
Haha +1
I bought an Antigravity lithium battery for my W212 as part of a weight-savings vision quest.
Made zero difference in ET or MPH. Along with the CCB's I swapped in, also made no difference in ET or MPH.
I had big dreams.
Nope.
Well, improvement (or the lack of) is as expected due to the measurement accuracy.
However, if you invested $$$s in accurate equipment, and then took precise measurement I would bet there might be at least few nanoseconds gain…LOL
Sorry, could not resist…
Haha +1
I bought an Antigravity lithium battery for my W212 as part of a weight-savings vision quest.
Made zero difference in ET or MPH. Along with the CCB's I swapped in, also made no difference in ET or MPH.
I had big dreams.
Nope.
They say every 100 lbs is worth a tenth in the 1/4 mile. That is why first thing people do is strip interiors. I refuse to do that. I will just invent in making more power.
They say every 100 lbs is worth a tenth in the 1/4 mile. That is why first thing people do is strip interiors. I refuse to do that. I will just invent in making more power.
I'm with you.
if you're buying a w213 amg as a drag strip racer and plan on stripping the interior to maximize gains ... you outta save your cash and look at a foxbody mustang 😂
Since this is a Mercedes forum, I feel like it's suitable to talk about the silver arrow 1934 Mercedes that was legendary because they had to strip the paint to make a weight limit, but I guess it turns out that was a myth
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
