Car wont start unless battery tender showing %80 charing and above

OneSickM · 12-02-2018, 01:28 PM

I am just looking for feedback. Battery test shows good for my 3 year old battery but wont start car unless I put it on battery tender and charge is above %80

I dont have any of the symptoms of showing battery is dying (no clock reset.. etc)

I bought a brand new battery just to see if really the battery is the proper and I am having exact same issue of not starting unless battery is above %80

Any one had same problem? Is it really battery or IBS is going Bad? I also disconnected the IBS from battery but that didn’t help as well.

///M Power-Belgium · 12-02-2018, 02:06 PM

Quote:

Originally Posted by OneSickM

I am just looking for feedback. Battery test shows good for my 3 year old battery but wont start car unless I put it on battery tender and charge is above %80

I dont have any of the symptoms of showing battery is dying (no clock reset.. etc)

I bought a brand new battery just to see if really the battery is the proper and I am having exact same issue of not starting unless battery is above %80

Any one had same problem? Is it really battery or IBS is going Bad? I also disconnected the IBS from battery but that didn’t help as well.

=> # 8 https://www.m3post.com/forums/showth...9#post23980179

tmak90 · 12-02-2018, 03:09 PM

I’m having a similar issue where I would put the car on a battery tender overnight and it would charge up to full. The next day I would take it out for a drive and come back to put it back on the battery tender and it shows as low. Ran codes and got 9D12 which has to do with the anti theft alarm battery system. Could this be a cause of parasitic battery drain? My battery is somewhat new being 3-4 months old.

amrazM · 12-03-2018, 04:07 AM

Quote:

Originally Posted by tmak90

I’m having a similar issue where I would put the car on a battery tender overnight and it would charge up to full. The next day I would take it out for a drive and come back to put it back on the battery tender and it shows as low. Ran codes and got 9D12 which has to do with the anti theft alarm battery system. Could this be a cause of parasitic battery drain? My battery is somewhat new being 3-4 months old.

Yeah newer cars are known for battery drain, CA door handles are a prime source of battery drain and it can lead you to think something is wrong with your alarm system.

OneSickM · 12-03-2018, 11:34 AM

Quote:

Originally Posted by ///M Power-Belgium

=> # 8 https://www.m3post.com/forums/showth...9#post23980179

Phillipe my question was not about what is causing the drain, my question is does it seem right that I need to have at least 80% charge inorder to start the car?

///M Power-Belgium · 12-03-2018, 12:01 PM

Quote:

Originally Posted by OneSickM

Phillipe my question was not about what is causing the drain, my question is does it seem right that I need to have at least 80% charge inorder to start the car?

OK . I see , and your situation is actually not normal .
If I charge my battery with my CTEK charger . I can start my car at anytime even when it's pretty low at only 25% .

My CTEK pictures => #26 https://www.m3post.com/forums/showth...1#post15488771

OneSickM · 12-03-2018, 12:30 PM

Quote:

Originally Posted by ///M Power-Belgium

OK . I see , and your situation is actually not normal .
If I charge my battery with my CTEK charger . I can start my car at anytime even when it's pretty low at only 25% .

My CTEK pictures => #26 https://www.m3post.com/forums/showth...1#post15488771

That's exactly what I am trying to find out. Why it wont start car even if I am on battery tender? Do you know what could be the issue?

///M Power-Belgium · 12-03-2018, 01:30 PM

Quote:

Originally Posted by OneSickM

That's exactly what I am trying to find out. Why it wont start car even if I am on battery tender? Do you know what could be the issue?

I have no idea .

OneSickM · 12-03-2018, 04:55 PM

Quote:

Originally Posted by ///M Power-Belgium

=> # 8 https://www.m3post.com/forums/showth...9#post23980179

getting back to you on this. if my start/stop buttom stays illuminated for ~2 minutes and goes off, does it mean my EDC is fine?

Something must be draining the battery and I cannot figure this out. If I fully charge battery with battery tender then remove the negative battery terminal and leave it overnight then test battery again. It stays 95% charge however if I keep the negative terminal on the battery overnight, it drops to %60. I cannot figure out what the problem is

TomHudson · 12-04-2018, 07:00 AM

You need to do a load test on battery.

It very well could be the starter, that’s going.

I just had a similar problem, battery tested OK, and the starter finally died.

///M Power-Belgium · 12-04-2018, 09:33 AM

Quote:

Originally Posted by OneSickM

getting back to you on this. if my start/stop buttom stays illuminated for ~2 minutes and goes off, does it mean my EDC is fine?

Something must be draining the battery and I cannot figure this out. If I fully charge battery with battery tender then remove the negative battery terminal and leave it overnight then test battery again. It stays 95% charge however if I keep the negative terminal on the battery overnight, it drops to %60. I cannot figure out what the problem is

Yes , then your EDC module is fine . But it's for sure your battery is draining pretty fast .

OneSickM · 12-04-2018, 01:20 PM

Quote:

Originally Posted by TomHudson

You need to do a load test on battery.

It very well could be the starter, that’s going.

I just had a similar problem, battery tested OK, and the starter finally died.

I am going to do a load test on battery today at nearby shop. But how can I determine if starter is giving up? Does the starter drain the battery overnight? I am only not able to start the car when battery is no longer holding the charge but I can start it every single time when battery is fully charged so this should rule out the starter

tmak90 · 12-04-2018, 02:41 PM

Did you run to check for any codes? I am having a similar issue and got a code for my anti theft alarm system battery being out which most likely is draining the main battery but have been trickle charging until I can troubleshoot the faulty batteries.

TomHudson · 12-04-2018, 03:14 PM

Quote:

Originally Posted by OneSickM

I am going to do a load test on battery today at nearby shop. But how can I determine if starter is giving up? Does the starter drain the battery overnight? I am only not able to start the car when battery is no longer holding the charge but I can start it every single time when battery is fully charged so this should rule out the starter

The battery is charged but resistance in the failing starter makes it harder to start.
Mine would start with a battery tender, then wouldn’t start the next day.

There were no codes.

Load test first.

Malek@MRF · 12-05-2018, 06:47 PM

Quote:

Originally Posted by OneSickM

That's exactly what I am trying to find out. Why it wont start car even if I am on battery tender? Do you know what could be the issue?

Either your battery safety terminal (unlikely) or the starter has failed.

OneSickM · 12-05-2018, 08:53 PM

Quote:

Originally Posted by Malek@MRF

Either your battery safety terminal (unlikely) or the starter has failed.

It is not stater. I can start car every single time if battery is fully charged. It is not even hesitating or showing sign of starter going bad

Malek@MRF · 12-07-2018, 12:17 PM

Quote:

Originally Posted by OneSickM

It is not stater. I can start car every single time if battery is fully charged. It is not even hesitating or showing sign of starter going bad

Have you checked your grounds?

M3ANMACHINE · 12-07-2018, 01:11 PM

Quote:

Originally Posted by Malek@MRF

Have you checked your grounds?

was thinking the same thing.

pbonsalb · 12-07-2018, 01:17 PM

Check the ground by left side header collector. Mine was disintegrating. Give it a tug.

Quick test. Put jumper cables from block to chassis under hood, with both cables as grounds. Then start car. Should fire right up.

OneSickM · 12-07-2018, 05:59 PM

Quote:

Originally Posted by Malek@MRF

Have you checked your grounds?

Quote:

Originally Posted by M3ANMACHINE

was thinking the same thing.

Quote:

Originally Posted by pbonsalb

Check the ground by left side header collector. Mine was disintegrating. Give it a tug.

Quick test. Put jumper cables from block to chassis under hood, with both cables as grounds. Then start car. Should fire right up.

Guys, can you explain more? My ground cable is connected and secured to the battery negative terminal. I cannot even remove cable from terminal because it was tightened very well. Also why car would start ONLY when it is fully charged. IT doesn't make any sense??!!

pbonsalb, are you talking about engine block? also chaises is painted so what part of chaisses are you talking about

pbonsalb · 12-07-2018, 07:16 PM

Engine block ground.

Obviously find bare metal or scratch some paint to ground. Go from the engine lift hook to a factory ground lug on the passenger inner fender for a test.

TomHudson · 12-08-2018, 07:03 AM

Quote:

Originally Posted by pbonsalb

Engine block ground.

Obviously find bare metal or scratch some paint to ground. Go from the engine lift hook to a factory ground lug on the passenger inner fender for a test.

Yes, I forgot that I did this as well to isolate my starter issue.

There’s a silver metal jumper piece on the right side of engine bay.
Remember you’re using one cable only as a replacement for ground.

12-02-2018, 01:28 PM	#1
OneSickM Captain 122 Rep 747 Posts Drives: M3 Join Date: Jul 2014 Location: --- iTrader: (2)	Car wont start unless battery tender showing %80 charing and above I am just looking for feedback. Battery test shows good for my 3 year old battery but wont start car unless I put it on battery tender and charge is above %80 I dont have any of the symptoms of showing battery is dying (no clock reset.. etc) I bought a brand new battery just to see if really the battery is the proper and I am having exact same issue of not starting unless battery is above %80 Any one had same problem? Is it really battery or IBS is going Bad? I also disconnected the IBS from battery but that didn’t help as well.
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12-02-2018, 03:09 PM	#3
tmak90 Private First Class 28 Rep 126 Posts Drives: 2017 C7 Grand Sport Join Date: Apr 2017 Location: Ft Worth, TX iTrader: (1)	I’m having a similar issue where I would put the car on a battery tender overnight and it would charge up to full. The next day I would take it out for a drive and come back to put it back on the battery tender and it shows as low. Ran codes and got 9D12 which has to do with the anti theft alarm battery system. Could this be a cause of parasitic battery drain? My battery is somewhat new being 3-4 months old. Last edited by tmak90; 12-02-2018 at 03:20 PM..
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12-04-2018, 07:00 AM	#10
TomHudson Major 658 Rep 1,118 Posts Drives: 2011 E90 M3 Join Date: May 2015 Location: Toronto iTrader: (0)	You need to do a load test on battery. It very well could be the starter, that’s going. I just had a similar problem, battery tested OK, and the starter finally died.
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12-04-2018, 02:41 PM	#13
tmak90 Private First Class 28 Rep 126 Posts Drives: 2017 C7 Grand Sport Join Date: Apr 2017 Location: Ft Worth, TX iTrader: (1)	Did you run to check for any codes? I am having a similar issue and got a code for my anti theft alarm system battery being out which most likely is draining the main battery but have been trickle charging until I can troubleshoot the faulty batteries.
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12-07-2018, 01:17 PM	#19
pbonsalb Lieutenant General 5234 Rep 10,614 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	Check the ground by left side header collector. Mine was disintegrating. Give it a tug. Quick test. Put jumper cables from block to chassis under hood, with both cables as grounds. Then start car. Should fire right up.
	Appreciate 0 Quote

12-07-2018, 07:16 PM	#21
pbonsalb Lieutenant General 5234 Rep 10,614 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	Engine block ground. Obviously find bare metal or scratch some paint to ground. Go from the engine lift hook to a factory ground lug on the passenger inner fender for a test.
	Appreciate 0 Quote