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      09-21-2014, 03:59 PM   #5
wildcatcrazy
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Drives: E90 335i
Join Date: Oct 2013
Location: USA

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2009 335i  [0.00]
No need to use BT cable to register a battery. Can do it with NCS expert and Tool32 with a KDCAN cable.

But, if you're replacing the battery with one of the same specs, you don't need to. If your AH changes or going from a non-AGM to a AGM, then yes.
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