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Old 05-09-2011, 12:38 PM   #9
mach.schnell
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Join Date: Dec 2009
Location: Amish country, PA
Posts: 689
My Ride: 08/2000 330Cic x2
Quote:
Originally Posted by egruber View Post
Also, some people thought that the convertible had a special battery type due to the extra vibrations that convertibles endure. I can tell you that the OEM battery is the same part number for convertible and sedan. The extra shock absorption is done via the tray.
The reason "some people thought that the convertible had a special battery type" is because the Bentley Repair Manual directly says so on page 541-1
Quote:
Caution -
The E46 Convertible requires a special battery which is designed
for constant vibration. A battery not designed for this will fail much
earlier.
Now at least for my mfg. date, there is only one part currently listed for the 'Vert -
80AH 640A 1 61218381749
(two other batteries have been discontinued)

There are two part#s currently listed for the Sedan:
70AH 570A 1 61218381738
80AH 640A 1 61218381749
(four other batteries have been discontinued)

While 61218381749 might still be listed for the Sedan, it doesn't mean that battery isn't the special design. More likely BMW realized the Sedan also needed the 'vert battery designed for vibration, or maybe they just wanted to eliminate parts.

Last edited by mach.schnell; 05-14-2011 at 06:41 PM.
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