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      11-09-2012, 07:36 AM   #2
lbernielu
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Drives: 2006 330i, sp, Bilstein, H&R
Join Date: Jul 2005
Location: Sacramento

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Probably more than one battery has been specified, such as 70 and 90 ah capacity, AGM and non-AGM. Those batteries are all listed in the required registration that must be programed for proper charging values (there are numerous posts on this subject). I personally have a Deka Exact fit 95? ah AGM replacement, the largest and heaviest possible at 60 odd pounds. The extreme lightweight batteries probably will not last 5 plus years, and may present cold weather starting issues. The weight savings, even if considerable, are not worth the additional cost over several years and loss of reliability to me.