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      07-03-2012, 11:15 PM   #11
Bamaben
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Drives: 07 335i blk/blk/alum 6MT
Join Date: Jun 2010
Location: Bimmertown

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Walmart batteries don't last more than 2 years. My factory one lasted 5.
My Indy shop wanted more than the dealer for the battery and registration.
I think when the battery starts going bad the CPU begins running higher parameters on the old battery to compensate for the weak battery. When you put a new battery in running higher parameter settings( because this was stored for the old battery) it decreases the life of new battery.
I paid $370 at dealer and a) Got a good battery that should last another 5 years at least. b) got it registered with dealer equipment and not worried if autozones battery tool correctly registered the battery.
This is why I went to dealer.
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