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      12-10-2009, 09:13 AM   #1
markymarc1979
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battery picture on my dash?

Battery image showing up on my dash when I start the car. Not sure what it means. Any ideas?
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      12-10-2009, 09:23 AM   #2
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My guess is that the system is reading a low battery voltage. Did you leave any lights on? Also, consider that in cold/extreme cold weather, it is normal for batteries to discharge more rapidly.

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      12-10-2009, 10:49 AM   #3
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Originally Posted by SUB-ZERO View Post
My guess is that the system is reading a low battery voltage. Did you leave any lights on? Also, consider that in cold/extreme cold weather, it is normal for batteries to discharge more rapidly.

-SZ
Havent driven the car for a couple weeks. Have it in storage. Took the cover off to start it up and noticed the warning light. Should I take it for a healthy rip on the highway to let alternator charge it up?
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      12-10-2009, 10:51 AM   #4
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Quote:
Originally Posted by markymarc1979 View Post
Havent driven the car for a couple weeks. Have it in storage. Took the cover off to start it up and noticed the warning light. Should I take it for a healthy rip on the highway to let alternator charge it up?
That explains it. Drive around for about 15-30 minutes and you should be ok.

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      12-10-2009, 11:11 AM   #5
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Yea I heard M3's don't store very well over the winter months. I stored my 335 last year and didn't have any problems. It's probably best to start it up once a week and take it for a good solid rip.
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      12-10-2009, 12:35 PM   #6
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Yea I heard M3's don't store very well over the winter months. I stored my 335 last year and didn't have any problems. It's probably best to start it up once a week and take it for a good solid rip.
Correct - not such a bad thing, is it?
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      12-10-2009, 01:18 PM   #7
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When not driving the car as much (say in the winter), I always put it on the BMW trickle charger. Of course, as I have a garage, that's easy for me. For those that park outside, not so easy as the hood is left open a bit.

My previous 535xi was a bad one for draining down the battery in the winter and that solved the problem on that car as well.
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      12-10-2009, 01:32 PM   #8
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Originally Posted by tuco44 View Post
When not driving the car as much (say in the winter), I always put it on the BMW trickle charger. Of course, as I have a garage, that's easy for me. For those that park outside, not so easy as the hood is left open a bit.

My previous 535xi was a bad one for draining down the battery in the winter and that solved the problem on that car as well.
All e9x vehicles are equipped with an Intelligent Battery Sensor (IBS) on the negative terminal which turns off (as commanded by the DME) within 1-2 hours after engine shutdown.

If you do use the trickle charger, make sure it is directly on the battery terminals (in the trunk) rather than underneath the hood.
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      12-10-2009, 02:22 PM   #9
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Quote:
Originally Posted by markymarc1979 View Post
Havent driven the car for a couple weeks......
You my friend need a battery tender.

Quote:
Originally Posted by tom @ eas View Post
...If you do use the trickle charger, make sure it is directly on the battery terminals (in the trunk) rather than underneath the hood.
Man, I did'nt know that. Thanks!
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      12-10-2009, 02:24 PM   #10
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Man, I did'nt know that. Thanks!
We may do a quick tech article on AGM batteries shortly to bring up some points on those storing the cars away in winter.
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      12-10-2009, 03:02 PM   #11
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Thanks for the feedback. Cold weather is a harsh reality when you live in Canada.
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      12-10-2009, 03:03 PM   #12
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Correct - not such a bad thing, is it?
Not a bad idea at all. I love spending time with my M3. We are so close!!!!
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      12-10-2009, 03:33 PM   #13
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I check the battery once in a while with a multimeter and follow this chart roughly to estimate the state of charge, then throw a battery tender on the car over night if it needs anything. Usually check the battery when it's cold to ensure a more accurate reading.

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      12-10-2009, 07:56 PM   #14
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Quote:
Originally Posted by tom @ eas View Post
All e9x vehicles are equipped with an Intelligent Battery Sensor (IBS) on the negative terminal which turns off (as commanded by the DME) within 1-2 hours after engine shutdown.

If you do use the trickle charger, make sure it is directly on the battery terminals (in the trunk) rather than underneath the hood.
The car does have IBS which shuts off interior lights and everything else after a while indeed, but you can definitely charge the battery from the terminals under the hood; I've been doing that all along. Those terminals are energized all the time (use a multimeter if you don't believe it), like if you were connecting directly from the battery.

OP, these cars keep a lot of crap running for a while, especially in summer (tranny cooler pump, amp fan, iDrive DVD drive, etc); you need to charge the battery regularly if car is not used frequently. And with the alternator disconnecting under some circumstances, even a long drive is not enough to fully charge the battery. And it's a big a$$ battery too. And remember once discharged, they don't really get to full charge anymore.
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      12-11-2009, 03:20 PM   #15
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Quote:
Originally Posted by tom @ eas View Post
All e9x vehicles are equipped with an Intelligent Battery Sensor (IBS) on the negative terminal which turns off (as commanded by the DME) within 1-2 hours after engine shutdown.

If you do use the trickle charger, make sure it is directly on the battery terminals (in the trunk) rather than underneath the hood.
Interesting. That is not what my service guys tell me at the dealership.

Nor is it what I did on my 2008 LCI E60 535xi all last winter, and it recharged fine off the under hood location.

Nor is it what I did just a few days ago, and I worked fine, again using the under-hood battery outlets.

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      03-29-2010, 09:06 PM   #16
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Low battery

I never had a problem leaving my car undriven for a week or so before. Today, after 9 days not driving, it barely started and showed the low battery symbol. The only difference, other than the battery is a little older (2 years) I can think of is I locked it so the alarm was on. I wonder how much curfrent the alarm draws in passive mode?
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      03-30-2010, 01:24 AM   #17
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FWIW, I used a battery tender via the underhood access points and had no issues this past winter.
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      03-30-2010, 09:44 AM   #18
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Quote:
Originally Posted by tom @ eas View Post
All e9x vehicles are equipped with an Intelligent Battery Sensor (IBS) on the negative terminal which turns off (as commanded by the DME) within 1-2 hours after engine shutdown.

If you do use the trickle charger, make sure it is directly on the battery terminals (in the trunk) rather than underneath the hood.
I disagree.

Quote:
Originally Posted by elp_jc View Post
The car does have IBS which shuts off interior lights and everything else after a while indeed, but you can definitely charge the battery from the terminals under the hood; I've been doing that all along. Those terminals are energized all the time (use a multimeter if you don't believe it), like if you were connecting directly from the battery.


Quote:
Originally Posted by osteome View Post
FWIW, I used a battery tender via the underhood access points and had no issues this past winter.


I connect my Battery Tender under the hood, and I never have a problem.

The Owner's Manual (page 214) states "Only charge the battery in the vehicle via the terminals in the engine compartment with the engine off."
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      03-30-2010, 10:03 AM   #19
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If for some reason the battery is drained and you loose all your presets (not only radio stations but all iDrive settings in general), is there a way to back these up or you will then need to re-set everything from scratch?
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      03-30-2010, 09:10 PM   #20
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Quote:
Originally Posted by AwesomeM3 View Post
Hey, what the heck does that smiley mean? Can't quite figure out that one. But doesn't look nice .

Quote:
Originally Posted by gr8000 View Post
If for some reason the battery is drained and you loose all your presets (not only radio stations but all iDrive settings in general), is there a way to back these up or you will then need to re-set everything from scratch?
The latter man. And don't blame the remote battery; once I left the battery out for days as a test, and settings were not lost after installing a new one.

I lost all settings myself once early on, but car battery was fully charged . Don't know what the heck happened, but hasn't happened again. Consider it an iDrive refresher course . And yes, it's a PITA.
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      03-31-2010, 10:42 AM   #21
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I was wondering if I disconnect the battery altogether for six months and then reconnect it...Will I have to reset anything or will the car start and act normal? I know with Audi I had to punch in a code to unlock my radio/CD player.
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      03-31-2010, 01:47 PM   #22
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Quote:
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Hey, what the heck does that smiley mean? Can't quite figure out that one. But doesn't look nice .
It was meant as "said in agreement"

Word:
1) well said
2) said in agreement
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