8 bar battery replacement metrics

[TimLee]

... What's to keep Nissan from making their Algorithm tougher, if their cash outlay for battery replacement gets higher than they want, and then downloading it to all of our cars? Essentially no one is "minding the store" in this situation.

But Nissan is only doing software changes at dealers.
Tesla and some other OEMs are doing "wireless over the air" software changes.
But not Nissan so far.

[mwalsh]

Fooljoe has stated that two weeks of LEAF charges, all below Nissan's published 66.25% bottom end of the 9th Capacity Bar did not cause that 9th bar to disappear from his display. Perhaps their is now more information on this particular case.

In my own experience (using a GID Meter for data and assuming 281 GID's for a 100% capacity new LEAF battery) my last 29 full charges have averaged 71%. The Nissan Published bottom end of the 10th Capacity Bar is 72.5%. Yet my 10th Capacity bar has not yet disappeared. I am wondering if perhaps the Nissan Algorithm is not based on an average at all, but instead counting the number of charges that are below (in my case) 72.5% with the start of counting being a full charge above 72.5%. If I take that approach, then my longest string of <72.5% charges is 9 charges. Perhaps Nissan wants 10 or 15 or more charges below 72.5% to remove the 10th Capacity Bar.

If Nissan is using the Gid (or any metric we've used to manufacture the Gid) as part of their formula, 66.25% of 281 Gids is 186, and I've been under that for most of summer already. I also think my reported Gids have been higher than many in similar circumstances, and I don't seem to loose Gids as readily as some seemed to have.

Edit: I've been under 186 Gids since August 21st, which happened to be 43.44AHr. And incidentally LeafSpy was reporting that as 66.22 CAP.

[iamchemist]

Well that is good to know, but it still begs the question "did Nissan make the algorithm tougher at my last 6 month LEAF check-up"? We would never know!

[cwerdna]

... What's to keep Nissan from making their Algorithm tougher, if their cash outlay for battery replacement gets higher than they want, and then downloading it to all of our cars? Essentially no one is "minding the store" in this situation.

But Nissan is only doing software changes at dealers.
Tesla and some other OEMs are doing "wireless over the air" software changes.
But not Nissan so far.

What other OEMs besides Tesla?

[JeremyW]

My guess would be it would be number of startups below a certain threshold. Remember that a lost bar always happens at startup. Perhaps those who are close to losing their 4th bar should start and stop their car a few extra times each day.

[TimLee]

What other OEMs besides Tesla?

Not sure.
One of the articles about the Jeep hacking mentioned that Tesla does remote software updates and said a couple European manufactureers were also looking into doing that.
May have been BMW and Mercedes, but I'm certain which article or the source.

[TimLee]

... And incidentally LeafSpy was reporting that as 66.22 CAP.

LEAFSpy reports SOH.
Was the 66.22 SOH?

[mwalsh]

Was the 66.22 SOH?

I have LeafSpy Pro, but invariably choose to use the older version of LeafSpy Lite, and in that it's still shown as CAP(acity).

TomT, I personally believe it's starts in conjuction with a full pack, but I could be wrong and am willing to try anything at this point.

[TomT]

Hey, it can't hurt!

TomT, I personally believe it's starts in conjuction with a full pack, but I could be wrong and am willing to try anything at this point.

[dhanson865]

... What's to keep Nissan from making their Algorithm tougher, if their cash outlay for battery replacement gets higher than they want, and then downloading it to all of our cars? Essentially no one is "minding the store" in this situation.

But Nissan is only doing software changes at dealers.
Tesla and some other OEMs are doing "wireless over the air" software changes.
But not Nissan so far.

But Nissan requires that you get the latest patches no matter what they are before they'll give you a new battery.

In the past that was the 3227 update, in the future?

and getting those updates reset the battery data so it takes weeks/months to get back to your bar loss level you should be showing. Even if the algorithm didn't change, resetting the battery data makes it harder to get a new pack.