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      12-15-2012, 11:08 AM   #1
Jxchen24
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M3 battery

I will be gone for 10-15 days. Is the battery gonna last or should I just disconnect it before I leave! Thanks y'all
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      12-15-2012, 11:10 AM   #2
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You should be good. Have left mine on several occasions for a similar time period with no issues...
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      12-15-2012, 11:10 AM   #3
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I have let mine sit for at least two weeks and it started up no problem. I plan to store the car this winter and I'll buy a battery tender for it when I do, but for a couple weeks I wouldn't worry about it.
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      12-15-2012, 11:16 AM   #4
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Holy shit.
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      12-15-2012, 11:20 AM   #5
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AT least make sure your doors are locked. I've left mine for a couple weeks, with the doors locked and it'd fine but if I leave the doors unlocked the battery dies in about 6-7 days.
I always make sure to put my battery tender on now... It will save your battery and keep it fully charged and takes about 30 sec's to hook up
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      12-15-2012, 11:28 AM   #6
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Quote:
Originally Posted by j2m View Post
AT least make sure your doors are locked. I've left mine for a couple weeks, with the doors locked and it'd fine but if I leave the doors unlocked the battery dies in about 6-7 days.
I always make sure to put my battery tender on now... It will save your battery and keep it fully charged and takes about 30 sec's to hook up
Seriously? If your battery dies in 6 or 7 days it sounds like its time for a new battery. I know its not good to let them sit very long, but they should last at least a few weeks without a charge.
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      12-15-2012, 01:03 PM   #7
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Quote:
Originally Posted by j2m
AT least make sure your doors are locked. I've left mine for a couple weeks, with the doors locked and it'd fine but if I leave the doors unlocked the battery dies in about 6-7 days.
I always make sure to put my battery tender on now... It will save your battery and keep it fully charged and takes about 30 sec's to hook up
Having the doors unlocked should not cause additional drain.

OP: You're fine leaving it for 15 days.
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      12-15-2012, 04:11 PM   #8
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I left mine on for 3 month while I was abroad.i was pleasantly surprised it could start when I got back.
U should have no problem
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      12-15-2012, 05:20 PM   #9
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Quote:
Originally Posted by Jxchen24
I will be gone for 10-15 days. Is the battery gonna last or should I just disconnect it before I leave! Thanks y'all
The car has several levels of "hibernation". You could leave all your doors and the trunk open, interior lights on and leave the country. It will go to sleep. If you come back to a dead battery, you have either a bad battery or a fault in your car system. Happy holidays!
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      12-15-2012, 06:34 PM   #10
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I left my radar detector on while I went to florida and puerto rico. Total time gone about 2 weeks. Battery was dead at the airport. Turn all of that trash off.
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      12-15-2012, 07:49 PM   #11
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If your car is a 2008 with the original battery and you're parking outside in the cold, you might have a problem. If you have a MY 2013, or a newer battery, you should be just fine.
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      12-16-2012, 10:48 AM   #12
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Your RD not being a factory equipment blocked your car from sleeping.
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      12-16-2012, 01:00 PM   #13
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Quote:
Originally Posted by DBH View Post
If your car is a 2008 with the original battery and you're parking outside in the cold, you might have a problem. If you have a MY 2013, or a newer battery, you should be just fine.
2nd this. I've got an '09 with original battery and if I know I'm not going to drive for a week or more I put on the trickle charger. Having navigation doesn't help matters.
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      12-16-2012, 01:00 PM   #14
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Unless your RD is hardwired and remains on when the engine is off, it would not matter. Certainly, on the '08s, the lighter voltage is turned off with the key and anything plugged into it.

John
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      12-16-2012, 04:50 PM   #15
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Quote:
Originally Posted by SonnyJack
Quote:
Originally Posted by DBH View Post
If your car is a 2008 with the original battery and you're parking outside in the cold, you might have a problem. If you have a MY 2013, or a newer battery, you should be just fine.
2nd this. I've got an '09 with original battery and if I know I'm not going to drive for a week or more I put on the trickle charger. Having navigation doesn't help matters.


Sorry. Not correct. Battery charger will fool your car into not hibernating. It will think there are accessories still being used. Research. If your battery is down after a couple weeks you either have bad battery or car is not functioning correct.ik
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      12-17-2012, 12:29 AM   #16
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Car should be fine. As others have said, battery tender is way to go if worried.
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      12-17-2012, 06:41 PM   #17
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Quote:
Originally Posted by VCMpower View Post
Sorry. Not correct. Battery charger will fool your car into not hibernating. It will think there are accessories still being used. Research. If your battery is down after a couple weeks you either have bad battery or car is not functioning correct.ik
Beg to differ sir. Battery's been checked and it's fine. Car's also been checked and it's fine. Batteries don't last forever and one nearly four years old will lose its' charge if not driven.
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      12-17-2012, 06:48 PM   #18
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Quote:
Originally Posted by DBH View Post
If your car is a 2008 with the original battery and you're parking outside in the cold, you might have a problem. If you have a MY 2013, or a newer battery, you should be just fine.
Yup, I need to replace my battery b/c of this after I went away for 2 weeks....car starts up but now every time I get in the car I'm getting the LOW BATTERY chime...guess its time to replace it especially since I'm leaving again for another week vacation

maybe I should leave it on the tender and see how it reacts when I come back
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      12-17-2012, 07:36 PM   #19
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Quote:
Originally Posted by VCMpower View Post
Sorry. Not correct. Battery charger will fool your car into not hibernating. It will think there are accessories still being used. Research. If your battery is down after a couple weeks you either have bad battery or car is not functioning correct.ik
I also beg to differ. BMW actually recommends using a battery tender (they'll even sell you one for ~$60) if you intend to store (hibernate?) your BMW over the winter months.
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      12-17-2012, 07:41 PM   #20
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Just take her out for a nice long drive right before you go.
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      12-17-2012, 07:56 PM   #21
VCMpower
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That is why I said it is either your Battery or your car is not hibernating. Glad you came to conclusion that a weak battery will discharge. Nevertheless, a good battery will allow the car to sleep and not discharge the battery.



Quote:
Originally Posted by SonnyJack View Post
Beg to differ sir. Battery's been checked and it's fine. Car's also been checked and it's fine. Batteries don't last forever and one nearly four years old will lose its' charge if not driven.
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      12-17-2012, 08:00 PM   #22
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Really? BMW? Or your Dealer? Hibernate is a term used in my industry, which includes BMW dealers, and it means your car will enter different levels of shutting systems down depending on length of non-use.


Quote:
Originally Posted by DBH View Post
I also beg to differ. BMW actually recommends using a battery tender (they'll even sell you one for ~$60) if you intend to store (hibernate?) your BMW over the winter months.
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