JZK26

know there has been at least one earlier (old) post about this but it did not include a resolution so wanted to see if anyone had any new ideas.

I suddenly got a pop up from the app and an automated email that the starter battery is critical. Note: car was not sitting idling for a long time, it was driven normally just last night, and the temp is in the 70s. Main battery charge was 40%.

Went to the garage to try starting the car. Would not start. Electronics (and even AC came in), but I did not get "ready to drive" and would not shift gears. Switched back off. Then in again - everything works.

Any idea how to avoid this in the future? Or what to do when this happens? For good measure, I'm now at a starting station charging the car, but I don't feel confident this won't happen again regardless of charge level of main battery.

buddy4406

Sounds like you may need to have the 12 volt battery checked out.
I didn't know the 2023 AMG EQS was even available yet.

c4004matic

It should recharge normally
If it happens again have it checked out.

W205C43PFL

As others mentioned, I guess it should charge once you have ignition on just like a conventional gasoline vehicle but you don't have to actually drive it maybe to properly charge it just keep it on for 30 minutes? Maybe the regen will help charge the 48V battery so it speeds up the charge of the 12V battery, not sure but I guess you can also just drive it around.

JZK26

I'm just upset this shattered my trust in the car. The fact that it didn't start at first is a problem for me. I need to know that when I need to go somewhere, I can get in my car and go. Especially if it's new. I know there are no guarantees, even with gasoline powered cars. Just didn't think I'd have challenges with it this soon. Hope this does not happen again.

W205C43PFL

I definitely understand your frustration, as you said hope it never happens again, if after driving it for long or having the battery charged for longer and the starter battery is still critical then yes do get it checked. I remember the vehicle will turn off ignition after a while if there is no one detected in the vehicle or if no movement or in a certain gear (like park?) so best is to just drive it on the highway or something , best of luck!

Tjdehya

I wasn't there and I don't know for sure but this sounds like user error. I think you psych yourself out when you got that message on the app. You said the car didn't start but you then say the electronics and AC came on which means... The car started.
It may be possible that you pressed the start button without your foot on the brake. That's honestly what this sounds like to me.
Its possible that you got in the car, pressed the start button (without foot on brake pedal), then depressed the brake pedal and tried to shift gears.
The car will do nothing if it is done this way and it wont even throw up a message telling you what you need to do.
I am not throwing shade but it sounds like the car worked just fine and you were just blinded by your presumption that you would have problems which then caused you to attempt to drive your car incorrectly.

JZK26

Not an impossibility, except for the two warnings that appeared in the car on the screens (not in the app) right after I tried starting it the first time (unsuccessfully): 12v battery critical and towing not allowed.

c4004matic

Gremlins.....

Utopia Texas

That is a odd warning. If you can’t start the car and towing is not allowed just what is someone supposed to do?

c4004matic

Its a BS warning. What it should really say is; boost 12v battery, HOWEVER, since you supposedly can't open the hood.... idiotic. All you have to do is open the hood and jump the 12V in order to shift the transmission to neutral. In fact, you can simply boost the battery and, if the car starts, just drive away (if the high volt battery has enough charge). The main battery should then charge the 12V as usual. Note: the 12V doesn't charge instantly! If this happens, once you get home charge the car on a level2 till "full" since that takes hrs it will charge both batteries. What usually kills tge 12V is having the car in park with accesories (which run off the 12) running for a long time. If you wsnt to avoid that andvrun stuff for a longvtime put the car in neutral and use the parking brake. Doing so keeps the 12V charged. Many owners have suffered this issue when thy take the car to het wraps and so on since most shops are not aware about this particular quirk.

JZK26

this is awesome. So just so I understand: I can sit in the car for an hour, with everything on, and just put it in neutral and use the handbrake and I'm golden abs everything stays charged?

c4004matic

Some people call it camping mode. Not recommended if the main battery is low. Of course...There is a crazy Thai in Norway that makes vids testing that!

Newbyloub

Just out of curiosity, exactly how do you open the EQS hood?

c4004matic

Many threads on it, do a search. Summary tge lever is in the same place as other MBs. Ender a plastic cover. Note no hood struts.

Newbyloub

Afyer nuzzling over your psy, iim thinking I cnoe wut yore tellin mr

Newbyloub

zorry for typohs

ua549

You should read your post prior to clicking the "Post Quick Reply" button.

W205C43PFL

I guess mistakes happens, I usually edit and note down reason of edit in that case.

c4004matic

Lets face it were not really writing in future divine comedy prose here. If you can read it, it's served it purpose. Typos be damned!

Newbyloub

Suit yourself as you plainly will, with your half a dozen mistakes above. Having been raised that a word with a dropped apostrophe or an un-dotted “i” was misspelled; having had a BSME brother whose Cornell University lab reports were given separate grades for English and content, and who once spelled a word in a document three different ways, all incorrect, and as proofing editor for our museum, I cannot agree.
I make no claim to perfection, but when using a comma can change the meaning and comprehension of a sentence, or a document, the effort to write correctly is important.
Careless writing is acceptable only to the “I could care less” crowd of casualness…and can and
does have the same impact as “the want of a nail” had in the “loss of a kingdom.”

c4004matic

No life, I guess. Sad.
You forgot your Paxil.

Newbyloub

This 90 year-old who needs no Paroxetine, nor phony cynical sympathy, is leading an active and interesting life, thank you very much! 😃👍👋

c4004matic

Namenda then! Grandpa you're slipping! Emotional lability is a sure sign of the plaques, tangles and amyloid taking over. I should know I examined hundreds of brains.

Newbyloub

That’s “Great-grandpa,” with respect, if you please…