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      02-16-2013, 02:04 AM   #18
JHZR2
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Drives: 91 E30, 11 135i cv
Join Date: Mar 2009
Location: New Jersey

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I thought it was roughly $100 to just reprogram for the battery (why I have no clue, it should be a few buttons like the maintenance computers, which also use an algorithm, have).

$400 sounds to me like the cost to re-code the car for a different battery, e.g. go from flooded to AGM type battery, since the module apparently gets downloaded, adjusted/recoded and then re-uploaded.

These batteries arent that funky. If an AGM, Id say $200ish, but a regular flooded battery should be around or even sub-$100.

I wouldnt cross the maps between AGM and flooded, as the charge and float voltages ARE different. But Id consider just swapping a flooded battery, especially if it were a slightly bigger one. I know for a fact that a group 49 (MB diesel) battery fits in the mounting area.
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