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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 10-28-2013, 01:01 PM
F1Ace F1Ace is offline
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How long can you play your radio before your battery complains? '02

Hey!

I have a great 02 745 which is in basically mint condition, but in my 6 years of
ownership I can't seem to solve my battery issue.

When I turn off the car and play the radio it's only like 3 or 4 minutes and it
comes up with the "recharge your battery" warning. That's rediculous since
my 6 can go for like 10 or 20 minutes before it does. AND, when I got a new
battery a few months ago the 7 did do as well. But it's back to it's old tricks
and giving me that grief again. Drives me nuts.

I had the alternator replaced last year so that's new as well.

The dealer likes to suggest it's all the cold weather accessories, like heated
seats, rear window defrost etc. that I use, but this is now summer use, and I
use none of those things.

Some may suggest I have a battery drain, but I would say I leave the car for
a week or two at a time and never have a problem starting it. If I charge it now
it will probably show it's at 60% again. I get it to 100% and it will be fine for a
few weeks and then here I am again.

So seriously, how long can you play your radio without the car running?

Any other ideas?

Thanks!
Wes
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  #2  
Old 10-28-2013, 02:36 PM
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the car should be able to run on aux power for twenty min, the car goes to sleep.
so it is your battery. make sure you have the right amp battery and have it registered to the car.
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  #3  
Old 10-28-2013, 03:51 PM
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I bought a C TEK battery charger (one of the only ones approved for AGM batteries and also OEM approved) and it takes a full 36 hours to top up my battery. These cars put a lot of demands on the battery and unless you're driving it routinely for extended periods of time you'll be surprised at just how much they are slowly draining your battery. I top mine up with the charger every few months and can always tell the difference after the charge. Plus a fully charged battery will usually last 2-3 years longer than a partially discharged one and at BMW battery prices that's a lot of $$ saved.
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  #4  
Old 10-28-2013, 05:23 PM
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If you run the radio with the engine off a lot you are causing permanent damage to the battery. I think the "recharge" message comes up when the battery voltage goes below 12.0 volts. Using the wrong battery charger can deliver too much voltage to the battery and can cause damage too.
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  #5  
Old 10-29-2013, 06:26 AM
F1Ace F1Ace is offline
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Quote:
Originally Posted by spyders 745li View Post
the car should be able to run on aux power for twenty min, the car goes to sleep.
so it is your battery. make sure you have the right amp battery and have it registered to the car.
Actually the dealership was the one to put in a BMW battery
and register it. This is the second time in 3 years. Each time it seems to last
about a month or so and then it's back to it. Hard to believe I have to charge
the battery off the wall every few weeks when I just drive it and it's summer.

So this isn't just a problem with the '02's or something, is it? No known updates
in that area that corrected this? People with 02's and 03's not having this problem?

Thanks!

Wes
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  #6  
Old 10-29-2013, 08:55 AM
pedro2u pedro2u is offline
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There was another thread on this. Repeating here what I posted there:

You might want to listen to the radio/cd with the ignition off. Just eject the key and hit the radio "ON" button. That way all the other car electronics are off and only the radio is on. I've never seen that "recharge" message since I started doing it that way

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  #7  
Old 10-29-2013, 12:45 PM
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Well that's a pretty slick trick, thanks!

Wes
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  #8  
Old 10-31-2013, 01:32 PM
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sorry to hear, hope you can get this resolved asap.
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  #9  
Old 10-31-2013, 10:12 PM
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Re: How long can you play your radio before your battery complains? '02

You have an open circuit locate that and all good from there. Do yl have any existing problems? Any other lights on on the mmi?

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  #10  
Old 11-02-2013, 10:44 AM
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Quote:
Originally Posted by spyders 745li View Post
You have an open circuit locate that and all good from there. Do you have any existing problems? Any other lights on on the mmi?
I think that may be the only remaining possibility, maybe I'll ask the dealer to check
for that next time I'm in. It's frustrating, since the battery's new, the Alternator is as
well, and asking them to check the charging system will probably waste another $150.

But there are not other indicators on, or malfunctions. Hard to know where to look
next, so yours is at least one good idea. And I take it then that it's not normal, what
I'm experiencing, so that's hopeful.

Oh, and I tried that "listen to the radio with the key out" and the radio never came on.

Thanks, and any more ideas, keep 'em coming!

Wes
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  #11  
Old 11-02-2013, 12:09 PM
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Re: How long can you play your radio before your battery complains? '02

In order to listen to radio with out key. You must run the car first. Then shut it down removing key. Then press radio button

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  #12  
Old 11-06-2013, 06:49 AM
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Quote:
Originally Posted by spyders 745li View Post
In order to listen to radio with out key. You must run the car first. Then shut it down removing key. Then press radio button
Ya, I tried that, couldn't get it to work.

I still wonder if it's a drain, maybe not. I can drive the car for hours
and then put a charger on it and the battery's 60%. Alternator then?
No, it's new. Battery? No it's new. Ugh!

Wes
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  #13  
Old 11-08-2013, 04:54 PM
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Re: How long can you play your radio before your battery complains? '02

Did register the battery? If you haven't you should now!!!!!!!! Look at your power module. May be the cause

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  #14  
Old 11-08-2013, 05:21 PM
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No one answered OP's question. Mine has always been less than 5 minutes before the recharge message even after being hooked up to the BMW battery tender. Its been this way for 6+ years. Other than that it has NEVER been an issue, no gremlins or anything so I leave it alone.
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  #15  
Old 11-09-2013, 09:23 AM
F1Ace F1Ace is offline
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Quote:
Originally Posted by Expo BMW View Post
No one answered OP's question. Mine has always been less than 5 minutes before the recharge message even after being hooked up to the BMW battery tender. Its been this way for 6+ years. Other than that it has NEVER been an issue, no gremlins or anything so I leave it alone.
Thank you!

And yes, the battery was registered, but I am not clear on what he meant
by "look at your power module". If he could elaborate......?

Still doesn't make sense that the battery doesn't stay at 100% after being driven.

And ya, are there others with a similar year car that can listen to the radio longer?

Thanks!
Wes
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  #16  
Old 11-19-2013, 11:48 AM
F1Ace F1Ace is offline
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Quote:
Originally Posted by Expo BMW View Post
Mine has always been less than 5 minutes before the recharge message even after being hooked up to the BMW battery tender.
I have the car in for this issue again, and they tell me they are selling new cars
with battery chargers already installed so people plug them in regularily, is that
what you got/do? I find this unbelievable, that they would need to suggest this.
And as you say, it doesn't actually fix this problem.

I connected a battery charger after I got home the other day, it was at 60%.
Charged it to 100%, listened to the radio, and it chimed after 1 minute. C'mon.
Neither the 60% nor the 1 minute is acceptable. This is crazy.

Wes
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  #17  
Old 11-19-2013, 11:54 AM
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I have played my radio for about 20 minutes + with no issues.
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  #18  
Old 11-19-2013, 01:56 PM
Qmetro Qmetro is offline
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How long can you play your radio before your battery complains? '02

I have recharge battery light come on after car off and radio on. Checked battery reading 11.7v on battery , under 12v. Purchased a new AGM AUTOZONE battery, pulled old one out. Corroding at the bottom lead acid cell battery. Installed new and registered battery with INPA. Radio on no message.


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  #19  
Old 11-19-2013, 08:12 PM
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Quote:
Originally Posted by F1Ace View Post
I have the car in for this issue again, and they tell me they are selling new cars
with battery chargers already installed so people plug them in regularily, is that
what you got/do? I find this unbelievable, that they would need to suggest this.
And as you say, it doesn't actually fix this problem.

I connected a battery charger after I got home the other day, it was at 60%.
Charged it to 100%, listened to the radio, and it chimed after 1 minute. C'mon.
Neither the 60% nor the 1 minute is acceptable. This is crazy.

Wes
I use the BMW battery tender that the dealer sells. I can leave it connected to the terminals under the hood all week and I still have a minute or so until the "recharge" message comes on. Mine is an 02 as well but unlike you my battery is not new. I will say that I am able to leave the car parked for weeks without the tender hooked up and it will still crank without a problem.
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  #20  
Old 11-20-2013, 07:39 AM
F1Ace F1Ace is offline
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Quote:
Originally Posted by Expo BMW View Post
I use the BMW battery tender that the dealer sells. I can leave it connected to the terminals under the hood all week and I still have a minute or so until the "recharge" message comes on. Mine is an 02 as well but unlike you my battery is not new. I will say that I am able to leave the car parked for weeks without the tender hooked up and it will still crank without a problem.
Exactly, same here.

When I got my new battery this summer it worked awesome for weeks. Then it
eventually went back to it's old ways. I sat in amazement when he was telling me
they sell all BMW's now with battery chargers. I forgot to mention that my 6 NEVER
has this problem.

I think it's time I call BMW HQ and see if I can get any help there. This is not right.
Ya they have a million gadgets, but if I get in and drive it, then stop it, surely it can
charge enough to make up for the starter's 3 seconds of work, and the other accessories
while the motor's running and charging properly. Maybe it's a bad thing with the early
years. Never want to believe that, but who knows.

Wes
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  #21  
Old 11-20-2013, 10:12 AM
Qmetro Qmetro is offline
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How long can you play your radio before your battery complains? '02

I too was able to start & run vehicle. Still may need new battery. As told on this site vehicle is power sensitive. My answer came when I pulled out battery and actually saw the corrosion on the bottom of battery. It was cell battery too . Not worth overcharging alternator is 900$ on vehicles or getting stranded.


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  #22  
Old 11-20-2013, 12:50 PM
F1Ace F1Ace is offline
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Originally Posted by Qmetro View Post
I too was able to start & run vehicle. Still may need new battery.
I actually had a new battery put in by the dealer this summer.

Wes
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