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#1
10-21-2020, 09:38 AM
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Battery Drain?
I parked the 4.6 in the garage Saturday afternoon and Tuesday at 130am the alarm started going off a bunch of times. The key would not turn it off due to the battery being so low. I somehow got the alarm to turn off and later that morning I opened the door to find the battery completely dead. I have had the X parked for way longer than this before but the temps have been a bit lower, but I am not sure what caused the battery drain. I had to throw the charger on just to get the trunk open. I left it like this while I had work for a few more hours and checked periodically to make sure the shifter light was off confirming she is properly going and staying asleep. I later proceeded to pull the battery to hook up the charger directly to it. I left it on a 10amp charge for around 8 hours and then set it to 2amp later in the evening. The battery is now fully charged and im wondering if it's worth having the battery tested to rule it out as being bad or maybe something else is causing the battery drain? I scanned the car with ISTA and did not have any new or sensor related errors (I was checking for the common hood sensor issue or anything else similar). Any ideas would be greatly appreciated...
  
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport Last edited by Purplecty; 12-30-2020 at 12:49 AM. 
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#2
10-21-2020, 10:29 AM
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The best way to test the battery is with a load tester. The best way to check for a drain is to do a drain test with multimeter and battery switch(optional but makes things easier and results more reliable.) Even if the drain turns out to be acceptable you'll have good knowledge and a base line for next time so no time wasted.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#3
10-21-2020, 11:28 AM
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Quote:
 
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport
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#5
10-21-2020, 06:12 PM
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For our BMWs you would be lucky to get 5 yrs out a battery now a days. Especially if you live in the north where it goes down to -45c
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 2003 bmw x5 3.0i ,219000km build date 2003-08-18
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#6
10-21-2020, 06:51 PM
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Quote:
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport
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#7
10-21-2020, 07:10 PM
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Quote:
"They don't make 'em like they used to" might very well apply here A few weeks ago I treated myself this battery tester from Amazon and tried it on the fleet. https://www.amazon.ca/gp/product/B07...?ie=UTF8&psc=1 I had a few batteries ranging from few months old to a couple old long dead and I'm happy to say it was VERY accurate in my case. This little tool also tells you the health of your battery and it seems about right. My brand new battery shows as 97% health and a battery I've had for several years in a car that's been sitting and gets a lap or two around the block every few weeks shows about 58% health. It also will check your charging system/alternator while you're at it as well
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#8
10-23-2020, 12:06 AM
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Quote:
That being said, the new vehicles demand a lot more from their batteries.
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#9
10-21-2020, 03:58 PM
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Sorry forgot to post that the battery is from 2.19. I just removed all of the unnecessary modules from the driver side and the air pump(which wasn't connected but for easier access to the battery-I have coils that the PO installed in the rear in place of the airbags). I left the amp in there but it is already disconnected...
    
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport
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#10
10-21-2020, 06:14 PM
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You would think the battery would be good,not even 2 yrs old yet. But you never know.
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2003 bmw x5 3.0i ,219000km build date 2003-08-18
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