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      12-30-2020, 08:24 AM   #23
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You most likely have a bad battery but it is still good practice to get a battery tender if you're not going to drive it over a week at a time. This is not just a BMW thing and cannot be compared to an old Acura TL. These battery tenders are not overly expensive
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      12-31-2020, 10:48 AM   #24
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Quote:
Originally Posted by ROBM2C View Post
I have seen a lot of complaints about the battery discharge warning if you don't drive the car enough .

I haven't driven the car for 10 days . Today it started up fine but I got the "discharge" warning .

I went for a 120km drive on the highway got back after driving it for an hour and after I turned off the car ...I still got the battery "discharge " ..

Yes go to the dealer I know but anybody having the discharge warning after driving for over an hour ?

Is this just the nature of the car ?

I miss old cars let me tell you ...my old Acura TL could sit in -30 for a month and never have a battery issue .
I commented in a similar thread a couple weeks back, as I had a somewhat similar issue with my M2C over the last year or so, and have a couple other friends of mine that have an M2C as well.

I don't drive my car much (was ED, put 800 miles on in Europe, and only 1,200 since being back in the states), but it is kept on a trickle charger for at least a day or two if I'm not driving it for at least a week or 2. I started getting the "battery discharged, please start engine" notification almost every time I started the car - though never had any actual issues with it not starting back up or driveability/power issues when this notification comes up. Took the car in for it's second oil change (first oil change since the 1,200 break-in service), and mentioned the battery drain issue to the dealer. They ended up testing the battery, and also noticed that one of the battery cables was apparently loose, and said that the battery was good and didn't need to be replaced. This was a couple months back, and have driven the car with a similar frequency since and have not received the message again.

That being said, one of my good friends with an M2C daily drives his, but still gets the battery drain message every once in a while, so I really don't know. I also find it hard to believe that a loose battery cable could've been the culprit for me, but who knows? Maybe your battery cable is also loose and that's actually what's causing it. What trickle charge do you use? FWIW, here's the one I purchased a couple years back: https://www.amazon.com/BMW-Advanced-...113381&sr=8-25
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      12-31-2020, 11:35 AM   #25
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A loose battery cable can definitely cause a battery to not charge properly. I can't believe that a brand new BMW could have a loose cable...it must have been installed on Monday after Oktoberfest 😵*💫.
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      12-31-2020, 11:43 AM   #26
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@ROASTM

I have it on the charger as we speak lol

Ctek charger is what I have .

Also another thing to add.

My car was on the lot from new for 4 months . It didn't get driven much so before I even got the car I don't think the battery was full.

Plus it has not been driven much in the past 4-5 months too .
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      12-31-2020, 12:07 PM   #27
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Sounds like you have a defective battery, so get it checked.

Trickle charger shouldn't be necessary unless we're talking extended non-useage like over winter storage.

But for what it costs, a Ctek is a great investment anyway and will sort out the battery if it is a little tired but not completely f88ked.
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      12-31-2020, 12:57 PM   #28
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It just finished charging , full voltage 12.38volts .

I might use the reconditioned method , but since I'm due in 6 weeks I will wait to see what the dealer says first .
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      02-13-2021, 11:24 AM   #29
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2018 M2  [0.00]
Low Battery

Anyone know if these batteries can have distilled water added to them like older batteries? My battery is 42 months old and constantly informs me it is low on charge?
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      02-13-2021, 02:40 PM   #30
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Quote:
Originally Posted by chief1richard View Post
Anyone know if these batteries can have distilled water added to them like older batteries? My battery is 42 months old and constantly informs me it is low on charge?
No the batteries are maintenance free and sealed. No need to add water on these agm batteries.

If your battery keeps showing as discharged I have a few recommendations:

1) replace it with another agm battery of the same specs then code it.

2) pull the battery and try an agm reconditioning cycle with a ctek, I can't recall correctly if agms can be reconditioned so double check before you do this.
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      02-13-2021, 03:45 PM   #31
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My 997 drains the battery - very slow to turn over (crank) after more than 2 weeks without driving or being on a trickle, but it has a Tracker and is parked 2 floors down under solid concrete, so constantly trying to send a signal...

I suspect the iDrive/ Connected tracking on the M2 will also drain the battery in a similar way, but also have the M2C on a CTEK trickle charger as leaving any car battery for 2+ weeks without a trickle is not great/ shortens the life, even if cranking amps sufficient to start it.

I've permanently wired a quick hook up CTEK connector in the boot battery (not bypassing the battery mgmt system) with an extension so I can close the boot lid without damaging the seal (the extension is a narrow gauge cable).

Maserati GT drain is way worse than the Porsche, but again has a tracker (and Italian electrics )

CTEK MXS 5.0 is the way forward!
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      02-13-2021, 03:51 PM   #32
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Quote:
Originally Posted by M2000 View Post
My 997 drains the battery - very slow to turn over after more than 2 weeks without driving, but has a tracker and is parked 2 floors down under solid concrete so constantly trying to send a signal...

I suspect the Connected tracking option will drain the better in a similar way, but have also put the M2C on a CTEK trickle charger. Permanently wired a quick hook up in the boot battery with an extension so can close the boot lid without damaging the seal (the extension is a narrow gauge cable).

Leaving any car battery for 2+ weeks without a trickle is not good for it / shortens the life, even if cranking amps sufficient to start it.

Maserati GT drain is way worse than the Porsche but again has a tracker.

CTEK MXS 5.0 is the way forward!
If you wire it to the boot then don't attach the terminals directly to the battery or else you could damage the IBS. There is only one way you can safely connect the ctek terminals in the boot without causing damage, and that is by attaching it to the power wire and ground before the battery, there was a thread on it in this forum.


Personally I prefer how I hooked it up under the hood, that way you never have to open anything to access the CTEK connector, and it is also water proof in this area.

https://f87.bimmerpost.com/forums/sh....php?t=1756713
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      02-13-2021, 04:25 PM   #33
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Quote:
Originally Posted by F87source View Post
Quote:
Originally Posted by M2000 View Post
My 997 drains the battery - very slow to turn over after more than 2 weeks without driving, but has a tracker and is parked 2 floors down under solid concrete so constantly trying to send a signal...

I suspect the Connected tracking option will drain the better in a similar way, but have also put the M2C on a CTEK trickle charger. Permanently wired a quick hook up in the boot battery with an extension so can close the boot lid without damaging the seal (the extension is a narrow gauge cable).

Leaving any car battery for 2+ weeks without a trickle is not good for it / shortens the life, even if cranking amps sufficient to start it.

Maserati GT drain is way worse than the Porsche but again has a tracker.

CTEK MXS 5.0 is the way forward!
If you wire it to the boot then don't attach the terminals directly to the battery or else you could damage the IBS. There is only one way you can safely connect the ctek terminals in the boot without causing damage, and that is by attaching it to the power wire and ground before the battery, there was a thread on it in this forum.


Personally I prefer how I hooked it up under the hood, that way you never have to open anything to access the CTEK connector, and it is also water proof in this area.

https://f87.bimmerpost.com/forums/sh....php?t=1756713
Yep - thanks. Had researched beforehand - check out this thread - https://f87.bimmerpost.com/forums/sh...7&postcount=14

Appreciate checking / your follow up.

Cheers

Last edited by JustDrifting; 02-13-2021 at 05:42 PM..
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      02-15-2021, 02:08 AM   #34
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Quote:
Originally Posted by F87source View Post
Quote:
Originally Posted by chief1richard View Post
Anyone know if these batteries can have distilled water added to them like older batteries? My battery is 42 months old and constantly informs me it is low on charge?
No the batteries are maintenance free and sealed. No need to add water on these agm batteries.

If your battery keeps showing as discharged I have a few recommendations:

1) replace it with another agm battery of the same specs then code it.

2) pull the battery and try an agm reconditioning cycle with a ctek, I can't recall correctly if agms can be reconditioned so double check before you do this.
I read somewhere that you're not meant to use the recondition cycle on agm batteries. I think i read it in my Ctek mxs10 manual or ctek YouTube channel.
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      02-15-2021, 02:20 AM   #35
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Quote:
Originally Posted by Duke Silver View Post
I read somewhere that you're not meant to use the recondition cycle on agm batteries. I think i read it in my Ctek mxs10 manual or ctek YouTube channel.
Yeah I wasn't sure about this so that's why I said make sure to check if agm's were able to be reconditioned.

If that is indeed the case then replacement would be the option.


Also this just came to mind but I would scan the car for fault codes before replacing the battery. Make sure there aren't errors that is causing excessive battery drain.
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      02-18-2021, 04:00 PM   #36
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There's a TSB for bmw m2 battery discharge issues: https://www.carproblemzoo.com/tsb/bm...017-bmw-m2.php

Scroll down a little bit and you will see it.
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      02-18-2021, 06:10 PM   #37
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@F87source

So is a tsb same as a recall, do they have to fix the issue ?
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      02-18-2021, 07:15 PM   #38
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Quote:
Originally Posted by ROBM2C View Post
@F87source

So is a tsb same as a recall, do they have to fix the issue ?
No TSB's are just to let the dealer know that there is an issue and how to resolve it, if a customer's car exhibits the same symptoms listed on the TSB. A recall means all cars in that production date range must be brought back to the dealer and fixed regardless if it is showing symptoms or not and for free.

So with a TSB if the dealer says that your symptoms don't match no repairs will be done.
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      02-18-2021, 08:50 PM   #39
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Ccm displayed “increased battery drain” caused by controller

SIB 61 05 20
CCM DISPLAYED “INCREASED BATTERY DRAIN” CAUSED BY CONTROLLER

Hmm... see attached. I am not sure what to make of the problem and the solution. Hope it helps someone.
Attached Images
File Type: pdf MC-10172497-9999.pdf (78.6 KB, 83 views)
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      02-19-2021, 08:34 AM   #40
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@F87source

This is great information 👍, thank you .
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