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I would also agree it is not a "deep cycle". Are you looking for a deep cycle battery? The OEM battery in BMWs is actually pretty decent. Usually lasts a long time too!
The one in my M3 was atleast 5-6 years old when I finally replaced it with an Optima Red Top. Next will be a track battery though.
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2009 E70 X5 - Third Row - Rear DVD
Past - 04 4.4i Sport Package
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