Jud Chapin

Anyone know the CCA's on the starter battery? MB rates them in AH's, (105).

2012 merc amg

It's a big long monster battery, CCA is 900

Finn Donati

My 350 Bluetec battery is 12v - 105ah - 950a.

Jud Chapin

I did finally find this info in the MB WIS work shop manual which states it's 950 cca's.

Thanks for the responses, guys.

Finn Donati

You're welcome.

I have a related question; I have replaced the battery today. But i still have the warning in the instrument display.
It shows a symbol with an empty battery, and tells me to stop the car, put it in park, and leave the engine running.

Any idea how i can get rid of this warning?

I have messured the voltage, to about 12.5v with engine off, and 14.5v with engine running. So i would guess everything is ok.
But i still have the warning.

Jud Chapin

You made need to perform a sync procedure. Not sure. Try Googling for your model or perhaps someone will chime in.

Jud Chapin

This explains the sync procedure I believe.I recall having to do this on my '02 CL500 and I guess it still applies to more current models.


https://www.mercedes-benz-shop.ca/en...tarter-battery

http://www.mercedesmedic.com/mercede...placement-diy/

Finn Donati

It is solved.
The replacement battery was also bad.
A new one in today, and no more warnings.

Jud Chapin

Yep, the old dead "NEW" battery. Rare, but it happens. I learned to always test them before installation. Is it a MB battery?

Did you have to go thru the sync process?

Finn Donati

It was a used Varta battery, i had stored and recharged. Probably stored for too long, without charging. (btw. the original MB battery is also Varta).

I bought a new Bosch AGM, instead.

Yes, i did sync the windows.

LEGOIII

If your battery, was showing, correct voltage, how do you determine it was bad?

Jud Chapin

A bad battery can show correct voltage. That's why a load test is required to check a battery. In the case of the poster here, I assume his car wouldn't start.

Finn Donati

Correct. No-start after parking for a night.