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Confirmed with BMW dealer SA, OEM batteries for E70 X5M (S63) are considered "POWER AGM" thus needs to be selected "Snowflake" not "Car" mode regardless of ambient temp range, not so sure about other X5's 3.5/35D/5.0 OEM batteries.
And Dealer quoted me $675 for S63's new battery, told me S63 pretty much uses most $$$ battery in BMW along with M5/M6.
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