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Old 12-02-2012, 09:32 AM   #395
scottjoh
Registered User
 
Join Date: Aug 2008
Location: Torrance, CA
Posts: 1,977
My Ride: '99 323i & '02 540i
I keep telling people to measure the battery before doing anything, because, very very rarely does it need to replaced. Brand new batteries measure 2.95-3.00 Volts. The original battery will measure between 3.05 and 3.25 Volts. I usually fine bad buttons switches, broken connections or a cracked component. Failures I see are due to mechanical stress (1000's of button presses and physical shock to the key).
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