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Old 01-21-2015, 03:02 PM
ZetaTre ZetaTre is offline
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Join Date: Jul 2011
Location: Oceanside, CA
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My understanding is that batteries with a white casing are wet cell, while the AGM are black casing. Also wet cells have a vent while AGM do not have a vent. If you shake a wet cell you can hear the liquid sulfuric acid splashing around, while the AGM is totally silent (alternatively you can flash a light behind the casing and move it so you can see the shadow of the liquid moving around). If there's liquid, it is not AGM.

I have a 2009 35d (production 07-2009) and it had a wet cell white case battery with a vent. I just recently had to replaced it, and just like you, I could register the battery, but couldn't code and AGM (nor wanted to pay someone to do it) so I decided to replace it with the wet cell Interstate battery recommended here: http://www.xoutpost.com/bmw-sav-foru...ement-diy.html

BMW dealer network doesn't sell white case wet cell batteries anymore.
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