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      12-02-2012, 09:54 AM   #7
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bigjae1976's Avatar

Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Wichita, KS

iTrader: (14)

Garage List
2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
Originally Posted by pbonsalb View Post
The Mini battery is about 34 lbs. Maybe try the Deka ETX30L. It is the same as the biggest small Braille (the 21-22 lb one), but less than half the price. You can buy the Deka online or at Autozone. I ran one for about 18 months of year round driving in NH in my E36M3 before it could no longer start the car. I'd expect half that time in the E90M3. I now run the Mini battery in my E36M3.

Another little battery is the older Miata battery. Weighs about 25 lbs but is at least made to start a car.

Not sure what I will try in my E90M3 when the stock one goes. I know it is a big battery. But I also know that small batteries don't last long in new cars with lots of electrical draw.
Was your car a DD? Did you put a battery tenderer on it?
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red