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BMW does not change battery cells in packs. They're all the same. But larger capacity packs have more banks of cells in series, than smaller packs. The more cell banks, the higher amp flow they can handle. Should two of three banks have one bad cell in it, the whole bank will be limited to the...

Perhaps unrelated, but smaller batteries may (or may not) have less regen, depending on their charge levels.

All I'd like to see is turn on the rex at low rpm. I don't care if it's not maintaining charge. Running the rex at 2k rpm, reduces the battery load, and may actually get you to the hwy exit 50-100 miles away, without hitting the 6% mark. Once you're at the exit, the vehicle can easily gain soc...