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Old 12-08-2010, 12:25 PM
HPIA4v2 HPIA4v2 is offline
Join Date: May 2006
Location: seattle
Posts: 575
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Originally Posted by jvwiv View Post
Hi Guys, I recently changed out my x5 4.4i battery with an after market battery. Everything was working fine for 4 months, but now I am getting the fasten seat belt warning appearing randomly as well as the air bag light coming on randomly.
I just took the car in for service and BMW is claiming it is all related to the aftermarket battery.
In these posts I see many other folks asking the same questions, do I really need to pay over $350 USD for a battery when I can buy one down the road for $70-100 USD?
I'd like to understand what output (voltage and amperage) the battery should be providing to the car and if there is any one else who is experiencing the same issue. (Or is my dealer trying to make a few extra bucks off me???)
As everyone stated already, I have interstate battery DL49 (it's for X53 4.4i) for 2 years now and no problem.

Are you sure your alternator is fine, sometime dead battery is the aftrmath of bigger problem not the culprit.
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