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      08-23-2008, 01:41 PM   #17
crzy4135i
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Drives: 08 135i
Join Date: Nov 2007
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Quote:
Originally Posted by Red135 View Post
I thought the problem with replacing the battery was that it had to be able to handle multiple charging cycles because the system charges during breaking and coasting.
BMW allegedly uses an AGM battery for that reason. They can handle being partially charged and more charge cycles, etc. The
lightweight Odyssey batteries are AGM..

I say "allegedly" because the portly stock battery shown in the picture looks just like a standard old style lead acid battery. It even has the green dot and you can see what looks like acid/water fill ports under the stickers. I'm confused.

IF you read the tech info posted somewhere on this board, the efficient dynamic feature is turned off if the voltage sensor determines the battery isn't keeping up. So.. if I install the smaller Odyssey battery and it can't keep up.. the sensor should defeat the efficient dynamic charging function and allow the alternator to function like all other cars do.
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