Quote:
Originally Posted by onfireX5
FWIW my X5 35i has two batteries like the above pic.
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Yep. X5 35i / 35d / M all have 2 batteries. Oddly enough, the X5 50i doesn't have 2 batteries but just one large battery instead.
After observing the X5M DPs, it's not an eCAT which requires the battery to heat it up during cold start. It's due to the fan running 10-15min after shut down. The primary battery is not used for the fan cool down so there's enough amp to start the car.