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7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

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  #26  
Old 01-21-2013, 07:01 PM
unleashd unleashd is offline
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Dropped the car at the dealer today after receiving the same "Increased Battery Discharge" and "Battery Low" Warnings. Hope to hear back from SA tomorrow. Mine is an '09 750i with 35K miles. With my recent long daily commute (~80-90 miles roundtrip), I stopped driving the BMW on the weekdays and use the Prius instead. The 7 is more of my weekend driver to the golf club, family trips etc. So, it hasn't seen much driving in the past 2 months.
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  #27  
Old 01-23-2013, 07:26 AM
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Dealer changed the battery for the 3rd time, saying it was not holding charge. I dread the next two years since CPO warranty does not cover battery.
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  #28  
Old 01-23-2013, 07:31 AM
unleashd unleashd is offline
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Dealer replaced battery for me under warranty. Advised me to drive atleast 30 minutes every week to keep the battery charged.
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  #29  
Old 01-24-2013, 05:39 PM
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Ok, my car is going back to the dealer tomorrow morning. I have driven a couple hundred miles this week and my “low battery” light keeps coming on. I have only had the car for 8 months. On Tuesday I drove 100 miles of highway. I’ll let you know what thy say.
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  #30  
Old 01-24-2013, 07:45 PM
dbs600 dbs600 is offline
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I've been having this problem too and now notice that the interior lights flicker when the car is on (they no longer light for courtesy when the engine is not on).
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  #31  
Old 01-24-2013, 07:56 PM
jwanes jwanes is offline
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Quote:
Originally Posted by Richard109 View Post
Ok, my car is going back to the dealer tomorrow morning. I have driven a couple hundred miles this week and my “low battery” light keeps coming on. I have only had the car for 8 months. On Tuesday I drove 100 miles of highway. I’ll let you know what thy say.
I had the same thing happen to me yesterday. As I was driving to work the climate control system stopped working. I called the dealer and dropped by as I was close. As soon as I got to the dealer, the message saying "charge battery" was displayed as well as "increased battery discharge". I left it there and apparently they could not find anything wrong. They charged the battery for a few hours. I picked up the car and the message was still on, I drove for about 50 Km and when I got home and turned the car off the "charge battery message" was displayed again.

I went out and bought a charger and charged the battery overnight. This morning the light on the charger was green meaning fully charged. i drove the car to work and the display was still saying increased battery discharge. when I got to work the check control said "all systems OK" but the dash said "charge battery". I took the car for a 30 km highway drive and when I got back the messages were gone.

After work I drove home and the dash again said "charge battery" and "increased battery discharge". I measured the voltage and it was 12.96V which is not exactly low. So I have it on the charger overnight again. BTW The temperature was -19 C yesterday and -15 C today which contributed to the problem. This is very frustrating! The car should be designed to handle the various additional electrical loads the car has.
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  #32  
Old 01-25-2013, 10:00 AM
GTZ GTZ is offline
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Hello from Greece.
I have no battery charging warnings till now,although I use the car once or twice a month.I own a charger (brand:Black and Decker) and I want some advice...
Where are the battery terminals for using external chargers?
Do you have to disconnect negative pole from the battery first to avoid electronic damage?
This is my charger:


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  #33  
Old 01-26-2013, 11:54 AM
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Quote:
Originally Posted by jwanes View Post
I had the same thing happen to me yesterday. As I was driving to work the climate control system stopped working. I called the dealer and dropped by as I was close. As soon as I got to the dealer, the message saying "charge battery" was displayed as well as "increased battery discharge". I left it there and apparently they could not find anything wrong. They charged the battery for a few hours. I picked up the car and the message was still on, I drove for about 50 Km and when I got home and turned the car off the "charge battery message" was displayed again.

I went out and bought a charger and charged the battery overnight. This morning the light on the charger was green meaning fully charged. i drove the car to work and the display was still saying increased battery discharge. when I got to work the check control said "all systems OK" but the dash said "charge battery". I took the car for a 30 km highway drive and when I got back the messages were gone.

After work I drove home and the dash again said "charge battery" and "increased battery discharge". I measured the voltage and it was 12.96V which is not exactly low. So I have it on the charger overnight again. BTW The temperature was -19 C yesterday and -15 C today which contributed to the problem. This is very frustrating! The car should be designed to handle the various additional electrical loads the car has.
We got a bunch of snow yesterday so I did not take it in. I dropped it off at the dealer this morning and they have it on the charger. I am going to go back and pick it up today around 4. I am hoping that a few hours on the charger will make difference.

The way I understand it, the battery only is charged while braking. So driving at highway speeds may not do anything.

I have to drive about 150 miles on Monday and I sure hope I don't get stranded somewhere.

@GTZ, connect the positive to the positive terminal, it is under the red cap, just flip it up. Connect the negative to the "body ground or special nut that acts as the negative terminal". It is on the front left side near the fender. It kinda sticks out as the negative.
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  #34  
Old 01-26-2013, 12:23 PM
jwanes jwanes is offline
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My car does not have brake regeneration so the alternator is what charges the battery when the engine is running and at highway speeds the charging is constant and at reasonable RPM. Your car should be the same. brake regeneration is only there to help recover the braking energy but it does not replace the alternator which charges the battery and provides for the electrical loads while the engine is running. Your 150 mile drive should not be a problem if the charging system is working which I suspect it is. In fact it will be good for the car's battery as it will be fully charged. I took the car out today and the battery charge message is gone, probably because I charged the battery, and the weather is warmer than a couple days ago.
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  #35  
Old 01-26-2013, 02:19 PM
kt2 kt2 is offline
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Ok, for so all of us low mileage 7ers, has anyone found the BMW part number that is correct for us to recharge/"maintain" the battery? In my 911 (should have kept it!), it ran through the cig lighter. My concern is that as the battery wears down due to lack of use, I am losing my Dinan Stage 2 flash on the ECU (and probably other stuff I cannot keep track of). THe car is still super fast...but not sure I have the full stage 2 benefit. thanks for your help. kt2
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  #36  
Old 01-26-2013, 02:44 PM
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You are correct jwanes and I should have realized it. When I left the dealership this morning, one of the sales people told me that it only charges when you are braking. I never took the effort to think it thru and realize that was an inaccurate statement.

Anyway, I picked the car up today and it seems fine. We'll just have to see if it "stays fine". If not, I will be going back to the dealership for a new battery. I have only had the car 9 months.

Can you lose Dinan with a low battery? So if you get a new battery, the dealership would have to reinstall the Dinan software again??
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  #37  
Old 02-01-2013, 05:30 PM
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Everything has been good until today. The "Charge Battery" light came on again. Guess I will be taking it back to the dealer on Monday. I drove about 300 miles this week so either the battery got really weak before charging or the charging system is not working.
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  #38  
Old 02-20-2013, 06:36 PM
Cdnrockies Cdnrockies is offline
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I waited on posting as I wanted to see how the problem progressed. We started seeing the same "increased battery discharge" warnings as everyone else that didn't change regardless of how far we drove it. Most of our travel is highway miles of +40 miles so it shouldn't be an issue to keep charged.

Anyways, the warnings became more frequent until it threw a CEL yesterday. BMW tried to tell us to just drive it in and they'd look at it. I am working on the road at the moment and didn't feel comfortable with my wife having to drive it the +60 miles into the dealership with an unknown CEL. Told the dealer that I wanted it in writing that it was there recommendation in case anything further occurred. After that discussion, BMW Assist was called and they flat-bedded it in.

Battery demonstrated less than 50% charge and was replaced with a new, more powerful battery apparently (part #61-21-7-639-053). I find it interesting that this is a known, frequent problem but they continue to not address it. Curious is anyone knows if the more recent cars (ie. '12 or newer) have the upgraded battery that they just installed or if they are just ignoring it?
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  #39  
Old 02-21-2013, 03:14 AM
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Glad to hear you got a new battery!

I got the “increased battery discharge” warning again so I took it back to the dealer. They put it back on the charger for a day and told me that the cars computer says that I am making a lot of short trips and that is draining the battery. My office is only a couple miles from home and I usually make one 100 mile highway trip (round trip) per week. I would think that would be enough. I have never had a problem with any of my other cars and my driving habits have not changed. I have been out of town for the last 6 days, so now I am wondering if the car will start ok this morning. Lol.
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  #40  
Old 02-21-2013, 03:21 AM
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Glad to hear you got a new battery!

I got the "increased battery discharge" warning again so I took it back to the dealer. They put it back on the charger for a day and told me that the cars computer says that I am making a lot of short trips and that is draining the battery. My office is only a couple miles from home and I usually make one 100 mile highway trip (round trip) per week. I would think that would be enough. I have never had a problem with any of my other cars and my driving habits have not changed. I have been out of town for the last 6 days, so now I am wondering if the car will start ok this morning. Lol.
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Last edited by PREDATOR 007; 02-21-2013 at 03:23 AM. Reason: This double posted for some reason, Admin please delete.
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  #41  
Old 02-21-2013, 04:36 AM
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Update

Well I just went out to get in the car and none of the lights came on when I opened the door. The car did start, but the “charge battery” warning came on. Guess I will call the dealership today and see what they say. I think it’s time for a new batter.
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  #42  
Old 02-21-2013, 11:08 AM
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Def. needs a new battery. My car has been good since I changed a new battery.
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  #43  
Old 02-21-2013, 03:32 PM
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I stopped by the dealer and told the SA that the warning came on again. He said "it's sounds to me like you need a new battery". Taking it in tomorrow morning for a new one.

Anybody know if changing the battery will affect my Dinan?
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  #44  
Old 02-22-2013, 02:59 PM
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Update

I took the car in this morning for a new battery and they told me that the battery was draining because I am not making long enough trips. They also suggested that I take the key fob out of the car and lock it so that the computers shut down. Guess I will give that a shot and see if my problem is solved. I usually leave the key fob in the car when I pull into the garage. Makes it convenient.
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  #45  
Old 03-05-2013, 01:16 PM
BaranE BaranE is offline
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It might be related to this.
Attached Files
File Type: pdf high battery discharge.pdf (295.0 KB, 545 views)
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  #46  
Old 03-05-2013, 06:46 PM
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Originally Posted by BaranE View Post
It might be related to this.
Thanks for sharing. It seems the original 90 Ampere Hour battery was not adequate for all the electrical doodahs in the car. What is particularly annoying is the fact the fan keeps running every time you shut off the car for another 10 minutes.

They swapped my old battery to a new 105 AH battery and replaced the camera module that was draining the battery.

We'll see how long this one lasts.
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  #47  
Old 03-05-2013, 08:12 PM
Cdnrockies Cdnrockies is offline
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Originally Posted by azbimmer View Post
Thanks for sharing. It seems the original 90 Ampere Hour battery was not adequate for all the electrical doodahs in the car. What is particularly annoying is the fact the fan keeps running every time you shut off the car for another 10 minutes.

They swapped my old battery to a new 105 AH battery and replaced the camera module that was draining the battery.

We'll see how long this one lasts.
+1

I also received an upgraded battery when it was in a couple weeks ago. I was extremely happy the next morning when the CEL was back on again. They flat bedded it back for the second time in 3 days (we live 60 miles from the nearest dealership) and thankfully it at least wasn't the battery. Thermostat needed to be replaced.

Oh well. Frustrating the wife much more than myself (which is fair I guess since it's her primary not mine...lol). Upside for me is that I get to look at the Panamera again this weekend.
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  #48  
Old 03-05-2013, 11:17 PM
BaranE BaranE is offline
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I wonder if we all have the 90ah battery or it differs based on the options in the car.
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  #49  
Old 03-06-2013, 07:46 PM
Cdnrockies Cdnrockies is offline
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Originally Posted by BaranE View Post
I wonder if we all have the 90ah battery or it differs based on the options in the car.
My guess would be that we all have/had the 90ah battery. Mine's loaded minus the rear comfort seats and can't imagine that they'd change the battery for that one option.

Again, my guess is that they might not be required to do a recall as a weak battery may not be considered any kind of safety risk. Since they're not forced to do it they won't. Those that fail within warranty they replace. Those that squeak by they bill for.

Dealership relationships are huge. It's no different than the rear bumper clip issue on the X5's. There are constant reports of it occurring yet there was never a recall. My dealership was great and fixed it with no questions asked as they were aware of the problem, but others haven't been so lucky.

Again, just a guess.
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Last edited by Cdnrockies; 03-06-2013 at 07:48 PM.
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  #50  
Old 03-06-2013, 10:14 PM
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Originally Posted by Cdnrockies View Post
My guess would be that we all have/had the 90ah battery. Mine's loaded minus the rear comfort seats and can't imagine that they'd change the battery for that one option.

Again, my guess is that they might not be required to do a recall as a weak battery may not be considered any kind of safety risk. Since they're not forced to do it they won't. Those that fail within warranty they replace. Those that squeak by they bill for.

Dealership relationships are huge. It's no different than the rear bumper clip issue on the X5's. There are constant reports of it occurring yet there was never a recall. My dealership was great and fixed it with no questions asked as they were aware of the problem, but others haven't been so lucky.

Again, just a guess.
I've had 3 battery changes under warranty.I am hoping the diagnostic this time was correct. Extended warranty does not cover battery.

You are right about relationships. My SA is the best. Treat them nice, and they will reciprocate.
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