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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 12-22-2015, 07:11 PM
mschumpert mschumpert is offline
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Location: Charlotte
 
Join Date: Dec 2015
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Mein Auto: 525
How to find a battery drain?

Took my car by autozone and had them test the alternator and battery. They said alternator was fine, and that my battery needed recharging, but couldn't tell me if it was totally shot. I bought my car almost 2 years ago, and since I don't know the age of the battery, they simply suspected it might be bad, rather than being able to tell me it definitely needed replacing. They said I would need to leave the battery with them to give it a full charge to know for sure.

I didn't have much trouble with it starting until recently, and have noticed I also haven't been driving it as much. Could there be something going on that's draining my battery while it sits? If so, how do I troubleshoot and figure out what it is? Please keep in mind I'm a novice especially when it comes to electrical, but not scared to try and figure it out...thanks!
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Old 12-22-2015, 08:34 PM
DBM550i DBM550i is offline
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You most likely have a battery starting to fail, if so, save yourself a lot of trouble and replace it with an identical battery. If it's a BMW battery, buy the same BMW battery and have the battery registered to the car.
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Old 12-22-2015, 11:43 PM
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acoste acoste is offline
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Quote:
Originally Posted by DBM550i View Post
You most likely have a battery starting to fail, if so, save yourself a lot of trouble and replace it with an identical battery. If it's a BMW battery, buy the same BMW battery and have the battery registered to the car.
+1

but if you want to go the "smart" way, buy a multimeter that measures current (20A max) and connect it in series with the battery on the negative terminal. Let the car sit for hours and read the current. (don't play with the car since you might wake it up from sleep mode)
Just to give a far estimate, 1A of current drains a fully charged battery in 4 days.
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Old 12-24-2015, 09:08 AM
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txag_530i txag_530i is offline
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Mein Auto: 2006 530i
Here's a great DIY article about finding a parasitic drain:

Chasing a parasitic drain the easy way
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