Get the genuine BMW battery - I've discovered that the price is usually the same if not cheaper for a much better quality battery (even if made by the same supplier as the others).
I just did a quick lookup of the recommended AGM battery for Z4M (61212353811), it came up as $177 from my dealer.
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2024 X3 M40i
2014 550i
2008 Z4 3.0si 6MT
2011 Z4 35si (sold)
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