Discuss data from the LEAF Battery app, and Comparisons

[Stoaty]

Just ask them to do the CVLI procedure. That cell meets the criteria for replacement even at 80% charge. I have one that gets flagged at low charge, but barely:

Can you describe the CVLI procedure? What are the criteria for replacement?

[surfingslovak]

Just ask them to do the CVLI procedure. That cell meets the criteria for replacement even at 80% charge. I have one that gets flagged at low charge, but barely:

Can you describe the CVLI procedure? What are the criteria for replacement?

I would be curious to learn more too, in the meantime, some of the past discussion can be found here and here or here.

[TickTock]

Just ask them to do the CVLI procedure. That cell meets the criteria for replacement even at 80% charge. I have one that gets flagged at low charge, but barely:

Can you describe the CVLI procedure? What are the criteria for replacement?

I would be curious to learn more too, in the meantime, some of the past discussion can be found here and here or here.

All I know is what is published in the Service manual (April 2011 SM page EVB-268):

[TickTock]

EV1, I'm curious. Do you accept or deny the nag screen on powerup? The reason I ask is other people who didn't know they had a problem have been proactively called in to have cell pairs replaced. Apparently, Nissan is alerted to battery issues via their messaging system and wondered if maybe you were declining access.

[TomT]

Just to make it more confusing, this morning I was back up to 230 Gids for a 100% charge with a SOC of 95.3%... This with 54.22 AHr and a Health of 66.89%, which are both lower. Cell imbalance was 23Mv.

I simply can't make rhyme or reason out of these numbers...

Yeah, none of my numbers make a lot of sense to me. Just today I charged to 100% which gave 222 Gids (exactly what I had pre-P3227, by the way) but a SOC of 91.4%, which is low... My cell balance appears good (12 Mv) so I don't know what accounts for the low SOC and the very low Health...

So, I just installed the beta version of the App and was very surprised to find a Health reading of 67.11%! Anyone car to conjecture what that might mean?
My AHr is at 54.30 and my cell imbalance is 12Mv.

Well, I feel better now. I'm at 54.08Ah and 78.03% health. I thought that was a little low.

[Weatherman]

No matter what I've tried, I've never gotten beyond "Waiting 4 Leaf data"


I have it installed on a Samsung Galaxy S4 and use the Vgate ELM327. I got bluetooth activated and the Vgate device paired. I put the car into ready mode, plug in the Vgate and start the app, it goes through the various connection cycles, says "Waiting 4 Leaf data", and stops.

[EV1]

@ GregH

The app is setup incorrectly.. the shunt order is 8421, not 4812 as you have it configured

Thanks, that must be it. I never touched that setting, so I don't know why it's at 4812. I will check the shunt behaviour when I have the chance.

@ TickTock

Just ask them to do the CVLI procedure. That cell meets the criteria for replacement even at 80% charge.

Thanks, I will.
I always press the "OK"-button, otherwise not much info is given on that screen. But I did not activate Carwings. (reasons why, is a complete different discusion on itself, but one reason was that I was hoping not to have to press that OK-button all the time)
The car was purchased in march this year, and I have been very mild to the battery pack. That cellpair must have been not OK already then.

[palmermd]

@ GregH

The app is setup incorrectly.. the shunt order is 8421, not 4812 as you have it configured

Thanks, that must be it. I never touched that setting, so I don't know why it's at 4812. I will check the shunt behaviour when I have the chance.

what is this setting? What does it do, and if it is necessary to be a certain way, why do we have the option of changing it?

[FairwoodRed]

The shunt order is used to properly relate which shunts are “on” to the correct cell pair on your phone display. If you know a little about bit masking, that is essentially what this setting is changing. If you’re not too interested in shunting (red cells vs green cells) then leaving this setting will not change the rest of your data.

We have the option to change it because we didn’t know the correct bit order early on. Allowing each user to change it allowed more people to try different settings and see which one gave the best data. Perhaps in a future release, the default will be set to 8421.

[GregH]

@ GregH

The app is setup incorrectly.. the shunt order is 8421, not 4812 as you have it configured

Thanks, that must be it. I never touched that setting, so I don't know why it's at 4812. I will check the shunt behaviour when I have the chance.

what is this setting? What does it do, and if it is necessary to be a certain way, why do we have the option of changing it?

The best way to verify the correct shunt order (which bit in our data corresponds with which cell balancing resistor) is to see which voltages dip when the load is switched on... or of course EV1's extreme case of one really low cell and the BMS trying to bring EVERYONE else down to that level.

Sometimes after a full charge you may notice that after powering up the car it takes a few seconds for all the shunts to turn on. As the shunts turn on you can witness the voltages drop.. it goes from left to right (cell #1 to cell #96) and takes a few seconds. It's kinda cool. The pattern will persist for several on/off drive cycles as the BMS slowly bleeds down those particular cells. In general you'd expect the LOWEST voltages to be highlighted (or with a dot below in LeafDD) as these are the voltages being slowly discharged. They were too high at some point in the past but now the BMS has made the decision for whatever reason to bleed them down a little. It takes a while.