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Old 11-03-2009, 09:40 PM   #1
richmak
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Battery for E39 wagon

Is the battery the same between the E39 wagon and sedan? Is changing the battery easier or more difficult in the wagon?
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Old 11-03-2009, 10:00 PM   #2
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I don't see how it would be different. The powertrain and electrical is exactly the same.
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Old 11-03-2009, 10:33 PM   #3
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I just picked up a Eliminator 4900 (as recommended in an earlier thread in maxbimmer) from CT. It has 2 tube-openings but it doesn't come with any vent tubes ... should I reuse the current one from my OEM battery?
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Old 12-30-2009, 01:05 PM   #4
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I read this and the other thread recommending the Motomaster 9400 for the 540i. But other reliable sources have said that Motomaster is Exide which is not that great. What other options (outside of OEM) would be appropriate? The Optima Yellow Top from Costco has been suggested - but I have seen conflicting opinions on fitment.

Can some 540 owners here who have replaced their batteries with non-OE post what they have and at what cost and from where?

Incidentally I checked the CT website for the 9400 and it does not list it... what is the price on it now? Are there any fitment issues with it (I read in the other thread conflicting opinions on this too)?

Input would be greatly appreciated.

Thanks!
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Old 12-30-2009, 03:16 PM   #5
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when I had my 98 540i I had a Optima yellow top, had it for a couple of years with no problems, even when I left the car sitting for over a month it started right up when needed.

and yes the fitment does require some work, the Optima battery is smaller but taller than OEM battery.
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Old 12-30-2009, 04:18 PM   #6
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Quote:
Originally Posted by Quack View Post
when I had my 98 540i I had a Optima yellow top, had it for a couple of years with no problems, even when I left the car sitting for over a month it started right up when needed.

and yes the fitment does require some work, the Optima battery is smaller but taller than OEM battery.
Is there a specific part # or model # of the Optima Yellow Top or is it generic - i.e. all Optima Yellow Tops are the same size/capacity?
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Old 12-30-2009, 06:18 PM   #7
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+1 for Optima.

They're all the same output, within a colour group. The Yellow Top is smaller than the stock BMW battery but I have one in my Jeep for winching and it's power output is amazing. No matter how cold, it turns over just fine. The one downside is that they are expensive compared to a regular lead plate battery, but they last 8-10 years quite routinely.
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Old 12-30-2009, 09:20 PM   #8
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SO general consensus is: Optima Yellow Top > Motomaster 4900?
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Old 12-30-2009, 10:18 PM   #9
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Definitely!
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Old 12-31-2009, 11:24 AM   #10
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Would love to see how to make the fitment works. My E46 convertible needs a replacement soon ... and the performance characteristics of the Yellow Top would work well for cars that are not driven often.
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