Major battery manufacturers/retailers often have battery selection dialogues that will take your vehicle description and return the proper battery.

Yes, I believe that some modules will flake-out, that's why BMW says NOT to disconnect the battery for troubleshooting charging issues, the evidence that the modules might retain will be lost.

It is the Twenty-first Century, not much is as it was.

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Believe nothing read or heard without verifying it oneself unless it, Weltanschauung congruent, fits ones worldview.