This thread might just be my saving grace in my search for a battery replacement!
I'm currently trying to find a replacement battery for my '07 E92 328i and came across this thread while searching forums around the web. I know I don't have either an E93 or an M3, but after I did some digging I found out that my battery is unusual for a 328i to have (it has 90Ah/900CCA in a hardtop configuration). I've been searching for almost 2 weeks now for someone else who has a battery with similar output to mine with no avail - all other 328s from my model year either have a battery with 570CCA or 720CCA. Also my battery part number isn't listed for a 328i on RealOEM's webpage when I went searching for an OEM replacement.
CDT (or anyone else who followed in his/her footsteps), I would like to follow the route you went in replacing your old battery. I think the original battery in your E93 M3 is similar to the one in my E92 and was hoping you could confirm that with me before I purchase a new battery.
Pic of my battery's specs:
View post on imgur.com
Link for RealOEM's webpage:
http://www.realoem.com/bmw/showparts...99&hg=61&fg=30
Thanks for your time and Happy New Year everyone!