Happy ending
After placing the new battery in and hooking everything together (no leftover parts on this DIY this time) it cranked on the first try. I was a little suspicious at first that it could possibly still be the alternator, but they were put to rest when it turned over without a problem.
Like ZBB said the OBC memory was lost, but other than interesting tidbits oh history that were lost, big deal.
Easiest DIY to date.
I feel pretty fortunate to have extracted 5 1/2 years out of the original battery, as I recall having to replace the one in the E36 after only 4 years.
Who says BMW's aren't getting more reliable?
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