Page 1 of 2

Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 1:24 pm
by JeremyW
I have noticed in the past cell pair #57 has deviated when getting down below low battery warning. Soon it was "around" low battery warning. Then ~70 gids. Now, around 100 gids it starts deviating. It's obvious to me that I have a cell pair that is aging prematurely. Last night after going to 17 gids and checking leafspy, I know something is seriously wrong. Yes, I had/have regular capacity degradation but lately I wouldn't feel confident taking more than a 30-40 mile round trip with the car. My use for the leaf is very local, about 12 mile commute and 14 miles round trip to the girlfriend's house. But even with those very modest requirements I'm starting to really feel the pinch.

Image

The car goes to Glendale Nissan this afternoon, hopefully. This will be the thread where I document the progress. Due to the pack's age I don't think Nissan will be able to get away with replacing just the module, but we will see....

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 1:28 pm
by DaveinOlyWA
keep us posted!

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 1:37 pm
by mwalsh
Good luck!

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 3:11 pm
by Computerizer
If there's a chance that you might qualify for a new pack under the battery warranty (the loss of 3 bars within so many years or whatever it is), consider that if you get this cell's module replaced, it may increase your capacity such that you would no longer qualify for that warranty replacement within the time limits of the warranty. Then you will find yourself wondering whether you would have rather replaced one cell module or the entire pack.

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 3:38 pm
by JeremyW
Two things:

1. I do not qualify for the capacity warranty because I opted out of the lawsuit. Further, this is a lease that will not qualify for 4 bar loss before September 2015 when the lease is up.

2. My range loss is significant and I need every damn watt-hour since I currently only charge in public.

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 3:55 pm
by DaveEV
Good luck!

FWIW, I estimate that an average cell voltage of 3.74 should give you a SOC around 20% and an average cell voltage of 3.59 should give you a SOC around 10% based on some voltage logging / plotting I did a while back.

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Thu Nov 13, 2014 7:34 pm
by JeremyW
Dropped the car off, I gave them the two pages from the service manual and a screenshot of leafspy. Got a Altima for two days (after that I'll be driving my insight till the car's fixed), and thankfully my carwings says they didn't try to charge it (I brought it in just over LBW, it's now somewhere between LBW and VLBW).

So a thumbs up to Glendale Nissan, so far. :)

Oh and this morning I noticed that the deviation started at 120 gids (~30mv difference between average and cell pair #57). :shock:

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Fri Nov 14, 2014 1:03 pm
by JeremyW
Update: Nissan told me to pound sand.

Got a call from Glendale Nissan who said the car passed the CVLI test and that the tech line told them this was simply normal battery degradation.

It is not. The degradation was sudden over the last month. It is obvious that I have a cell that is weaker than the rest of the pack. Further, it looks pretty obvious that the car should fail this test.

I will continue to drive the car normally, documenting how fast this cell ages. I give it about a month before it throws code P33E6, which is for cell imbalance.

I will also begin to communicate with higher ups in Nissan.

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Fri Nov 14, 2014 1:42 pm
by DaveEV
Given the lack of luck people have had Nissan dealers running the CVLI test and failing it, I can't say I'm surprised.

It seems like if you don't trigger an error code, you have very little luck in getting Nissan to acknowledge an issue.

Oh well. It doesn't look like you have long to wait if it's gotten this bad in a month.

How well is the pack balanced at 80% and 100%?

Re: Taking my leaf in for Cell Voltage Loss Inspection

Posted: Fri Nov 14, 2014 2:21 pm
by smkettner
What is the criteria to fail?