The 40KWH Battery Topic

[kovadam]

Hi!

Strange thing happened in the last two days. From Saturday to Sunday the SOH dropped from 96.91% to 96.70%, then from Sunday to Monday the SOH dropped to 97.48%. Without any reason.
The car was not QC-d, the battery was not overheated, I charged using L1 charger (220V/10A) from Friday to Saturday to 92% SOC (from around 40-50%, used 8 hours of charging with the charge timer) and did not even use the car on the weekend, despite this, the SOH dropped 0.5%. Also Hx dropped from 114.58% to 114.23%.

Funny thing, that with a full charge I still get over 97% capacity, if I check the GIDs. I still can charge over 485 GIDS (488-490 some times, which is 97.6-97.8%, for a couple weeks ago I was able to charge till 38.1kWh capacity, which is way over 98%) which is 97.4% or above, and over 37kWh estimated capacity.

I think SOH & Hx are totally wrong with the new Leaf, and since the battery chemistry is totally different from the previous models, also the values mean totally different things, or are not even meaning anything regarding SOH, they are only some numerical data read from the CAN and interpreted as SOH, because it showed some correlation between bar lost and SOH value drop in the past, but only Nissan Engineers know what this values mean.

[LeftieBiker]

Strange thing happened in the last two days. From Saturday to Sunday the SOH dropped from 96.91% to 96.70%, then from Sunday to Monday the SOH dropped to 97.48%. Without any reason.

That last number is higher, not lower...

I agree that Hx is now useless (if it was ever really useful) but SOH seems to still be valuable, at least if you don't count very small changes as significant. BTW, if the above increase with the last number isn't a typo, that would be, I think, the first rise in SOH for a 40kwh pack we've seen.

[DaveinOlyWA]

Hi!

Strange thing happened in the last two days. From Saturday to Sunday the SOH dropped from 96.91% to 96.70%, then from Sunday to Monday the SOH dropped to 97.48%. Without any reason.
The car was not QC-d, the battery was not overheated, I charged using L1 charger (220V/10A) from Friday to Saturday to 92% SOC (from around 40-50%, used 8 hours of charging with the charge timer) and did not even use the car on the weekend, despite this, the SOH dropped 0.5%. Also Hx dropped from 114.58% to 114.23%.

Funny thing, that with a full charge I still get over 97% capacity, if I check the GIDs. I still can charge over 485 GIDS (488-490 some times, which is 97.6-97.8%, for a couple weeks ago I was able to charge till 38.1kWh capacity, which is way over 98%) which is 97.4% or above, and over 37kWh estimated capacity.

I think SOH & Hx are totally wrong with the new Leaf, and since the battery chemistry is totally different from the previous models, also the values mean totally different things, or are not even meaning anything regarding SOH, they are only some numerical data read from the CAN and interpreted as SOH, because it showed some correlation between bar lost and SOH value drop in the past, but only Nissan Engineers know what this values mean.

Well, when it happens again in approximately 90 days, it will be less strange. My Hx is over 120

[Jerryr]

Just as a point of reference. My brand 2019 SL Plus w/62 kWh battery, manufacture date 2/19. 46 miles on odometer after driveling it home from dealership.

[kovadam]

Sorry, it was a typo, 96.48, but after I left work in afternoon it was only 96.41%, so within 10 hours it dropped again 0.07% without any reason, the Hx dropped again a bit. Will see how this evolves, the car is 6 months old and has around 14000km on ODO.

[LeftieBiker]

Just as a point of reference. My brand 2019 SL Plus w/62 kWh battery, manufacture date 2/19. 46 miles on odometer after driveling it home from dealership.

The 98.96 SOH may be an indication that the 62kwh pack loses capacity at at least the same rate as the 40kwh pack. Where do you live, Jeryr?

[Jerryr]

Just as a point of reference. My brand 2019 SL Plus w/62 kWh battery, manufacture date 2/19. 46 miles on odometer after driveling it home from dealership.

The 98.96 SOH may be an indication that the 62kwh pack loses capacity at at least the same rate as the 40kwh pack. Where do you live, Jeryr?

Tampa Florida area.

[LeftieBiker]

Thanks. That's helpful information.

[danrjones]

So far - knock on virtual wood here - I've noticed my SOH decreasing by about 0.01 about every 2 days, regardless of miles. I guess that would come out to a 2% decrease per year, assuming my drop is even statistically relevant at this point. That would be a 20% loss of SOh in the 10 year warranty period, which is not enough to get a new battery. of course we aren't even close to the hottest time of the year yet. Only been in the low 90's so far.

I have been googling for 2020 leaf info but haven't found much yet. My plan since I got such a good deal on this one is to trade it in in a year or two for a new one with more range, so I'm curious what 2020 will bring.

[LeftieBiker]

I would expect your degradation to be less linear and more dependent on temperature, so little capacity loss in the cooler months, and much more in the hot months. How much more? I don't know - I tried my best to keep my car's pack cool in the hottest weather, and I have a 40kwh Leaf. Please keep us posted, maybe in a new, 62kwh battery topic...?