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7 Series (E23, E32, E38, E65, E66) General discussion and technical help for all year 7 series cars.

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Old 08-25-2006, 07:41 PM   #16
witeshark
 
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Quote:
Originally Posted by TerryY
One on each Side of the trunk?
I was looking at an 8 once and that sure had 2, one on each side of the trunk. Someone said it was for the auto windows that pop down a little when you lift the door handle to open the door so the rubber seal stays good
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Old 08-25-2006, 09:06 PM   #17
c1apton
 
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Quote:
Originally Posted by witeshark
I was looking at an 8 once and that sure had 2, one on each side of the trunk. Someone said it was for the auto windows that pop down a little when you lift the door handle to open the door so the rubber seal stays good
They also go up automatically when you exceed 100mph for aerodynamics
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Old 08-25-2006, 11:50 PM   #18
TerryY
 
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Two theories on why the 8 has two batteries.

First is the weight and balance theory that says the two batteries are the finishing touch on nearly perfect weight distribution front to back and side to side.

The second is that the two huge batteries and the 140 Amp alternator are there just to power all of the electronic toys that the engineers could stuff into the the car. After all it has "computers" in the door sills because they ran out of space in the conventional places.

When you close the door and lock the car it still takes about 15 minutes before everything is shut down. E32 7 series is almost as trippy as the E31 8 series because they shared engineering to a large degree.
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Old 08-26-2006, 12:06 AM   #19
BMWLotAttendant

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Well....

This just happens to be my lucky day.

I drove a 1991 850i with the V12 engine, and it had 1 battery. I'll get pictures tommorow if the car is still there.

And, back to the 7-series battery...sorry, I was thinking of an e38.
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Old 08-26-2006, 12:18 AM   #20
TerryY
 
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If that '91 850 only has one battery it is not to factory spec.

There should be one behind each side panel in the trunk.


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'98 SVT Cobra
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Old 08-26-2006, 04:54 AM   #21
c1apton
 
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Re: the 2 battery issue - it's a balance thing. Similar to Porsche 911 (one in each front corner)
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Old 02-17-2010, 10:29 PM   #22
SONcerely

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I too have a 1990 750IL. How do you get to the battery under the electric back seat? I don't see any releases.
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