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7 Series - E38 (1995 - 2001)

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Old 08-28-2014, 01:11 PM
AZBimmerCpl AZBimmerCpl is offline
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Location: Scottdale, AZ
Join Date: Nov 2013
Posts: 253
Mein Auto: 2002 530i (Auto)
Battery Differences E38 vs E39

After replacing the alternator in my 99 740il, I found that the battery was shot. Most likely due to the fact I ran it dry twice trying to limp the car home after the alternator went bad.

To get it home, I pulled the battery from our 02 530i and put it in the 740il. It started and ran fine. I need to go buy a new battery for the 740il and after looking at the part numbers and differences, I can't seem to find much of a difference other than the "Reserve Capacity" that the 740il has that the 530i battery doesn't

Would the 2 be compatible for short term or would it fry the 530 battery by using it in the 740il. I only plan on using the 740il for a few hours today until I get the battery.


ps. Kudos to me for a successful alternator DIY in my driveway much thanks to these great youtube videos! I put in a cheapy Ultima rebuild. I will find the alternator thread and post my review after a few weeks/months of driving it (if it lasts that long!)

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Old 08-28-2014, 01:59 PM
miguel740i miguel740i is offline
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Location: Mesa, AZ
Join Date: Nov 2013
Posts: 285
Mein Auto: 1995 740i
E39 batteries will work just fine, the battery in my car is actually supposed to go in an E39 but when wal mart is out of stock and you need your car to go to work the next morning you have to make do. A year and 2 months later and that battery is still good lol
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Old 08-31-2014, 07:55 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
Join Date: Aug 2008
Posts: 9,057
Mein Auto: 1997 740iL / 2006 X5 4.4
Ditto...both models use the same replacement battery sizes...49/H8 or 95R/ well as the e46 & e53. Come to think of does the e32/e34/e36/e52/e31/e60/e63/e64/e65/e66/e90/etc....hmmm, seems to be a pattern.
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)
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