The 40KWH Battery Topic

How are the 2019 40 KW batteries holding up? Any data someone can share?

In between my last big update and my next big 3 month update.

As of a few days ago:

2018 SV
Mileage ~3900
SOH 91.76
AHr 105.93
Hx 106.02

my last few readings.... slight decline in Jan after an increase in Dec.

Oct 21, 2019 - Km; 35500 Ahr; 104.06 SOH; 90.61
Nov 15, 2019 - Km; 37018 Ahr; 104.54 SOH; 90.56
Dec 14, 2019 - Km; 38703 Ahr; 105.07 SOH; 91.02
Jan 16, 2020 - Km; 40322 Ahr; 105.03 SOH; 90.98

Night leaf, is yours a 2018 or 2019 Leaf?
I am curious if the 2019 40 batteries are doing any better than the 2018 40 batteries.

DougWantsALeaf said:

Night leaf, is yours a 2018 or 2019 Leaf?
I am curious if the 2019 40 batteries are doing any better than the 2018 40 batteries.

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2018 if his profile is correct. Delivery date march 2018

DaveinOlyWA said:

DougWantsALeaf said:

Night leaf, is yours a 2018 or 2019 Leaf?
I am curious if the 2019 40 batteries are doing any better than the 2018 40 batteries.

Click to expand...

2018 if his profile is correct. Delivery date march 2018

Click to expand...

Profile is correct, March 2018.. 2018 SV.

22 months 2018 SV. The rate of degradation has really slowed during the second year.

Date SOH HX AH
3/9/2018 99.10 98.86 115.00
7/14/2018 97.13 111.58 112.13
9/21/2018 96.15 111.74 111.00
10/18/2018 94.91 112.07 109.56
12/31/2018 94.77 111.47 109.40
1/15/2019 93.69 111.75 108.16
1/21/2019 92.21 111.97 106.45
3/1/2019 92.14 112.26 106.37
4/6/2019 92.09 112.27 106.31
6/13/2019 91.34 113.00 105.44
7/1/2019 91.25 113.66 105.34
7/10/2019 91.20 113.80 105.28
7/12/2019 91.67 113.83 105.83
7/28/2019 91.60 114.00 105.74
9/10/2019 91.40 113.57 105.51
10/13/2019 91.92 113.52 106.11
11/11/2019 91.86 111.66 106.04
12/10/2019 91.84 111.83 106.02
1/10/2020 91.80 112.26 105.97

Wow, look at that, really flat for 10 months. Any changes in charging habits? I wonder if the leaf moves between estimated and actual SoH.

DougWantsALeaf said:

Wow, look at that, really flat for 10 months. Any changes in charging habits? I wonder if the leaf moves between estimated and actual SoH.

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There is no readout for actual SOH. Can only be estimated in several ways.

DougWantsALeaf said:

Wow, look at that, really flat for 10 months. Any changes in charging habits? I wonder if the leaf moves between estimated and actual SoH.

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No change in charging routine. I do baby the battery, keep it between 30 and 75%, charge it early morning so the battery can cool down over night and no QC charges. Last summer here in Atlanta it was warmer than normal, but even so the battery according to LS essentially stop degrading. I'm really curious to see what happens this summer. Also the big adjustments that have been occurring every three months appear to have stopped.

DougWantsALeaf said:

Wow, look at that, really flat for 10 months. Any changes in charging habits? I wonder if the leaf moves between estimated and actual SoH.

Click to expand...

I saw the exact same thing on mine. months 1-14 I lost 7%. Month 14-21 lost less than ½%

My slow loss period included the entire Summer which meant MUCH higher temps (after Rapidgate update, it was easy to hit 10, 11 TBs) and more driving.

Good news. you give me hope that my Plus battery will flat line in the 96%-97% range now that it has settled in. I am also trying to now keep the battery in a 20-90% range, though I occasionally make a mistake.

Dave, your Plus battery seems to be doing even better.

Good news. you give me hope that my Plus battery will flat line in the 96%-97% range now that it has settled in. I am also trying to now keep the battery in a 20-90% range, though I occasionally make a mistake.

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IIRC my 40kwh Leaf is down to just under 92% - or was last Fall. I keep the charge in that range, and cool the garage in Hot weather.

LeftieBiker said:

Good news. you give me hope that my Plus battery will flat line in the 96%-97% range now that it has settled in. I am also trying to now keep the battery in a 20-90% range, though I occasionally make a mistake.

Click to expand...

IIRC my 40kwh Leaf is down to just under 92% - or was last Fall. I keep the charge in that range, and cool the garage in Hot weather.

Click to expand...

It will be very interesting to see if my car bottoms out in the low 90's like ones seen here or whether my hot climate this next summer will keep it falling like a rock. Right now the daily drop is almost zero because the battery is cold all the time, but last 3 month adjustment was a pretty good hit. My next 3 month, if any, will be at the beginning of March. Still sitting at 91.76% as of yesterday.

DougWantsALeaf said:

Night leaf, is yours a 2018 or 2019 Leaf?
I am curious if the 2019 40 batteries are doing any better than the 2018 40 batteries.

Click to expand...

I was under the impression there was no change at all between 2018 and 2019 40kw or for that matter 2020, am I mistaken? Similarly I think my 2019 plus and the 2020 have no changes in battery or cooling.

The 62 Battery is a completely different chemistry than the 40, so its an open question about future reliability. The Plus owners are the guinea pigs. While I believe there is a small inverter fan on the Plus, I don't think there are any battery fans, just the very small heating element for very cold conditions. You can see in the 62 thread that while rapidgate does exist, it is a much much smaller issue than the 40 battery.

While the 40 chemistry is for all intensive purposes the same (As far as we know), its been seen in earlier model years that the batteries sometimes get better year 2 as the manufacturing process is improved and quality goes up. that's why I am curious about the 2019 40 batteries.

Thanks for explaining that there has been improvement in the past possibly due to manufacturing improvements. That is nice to hear.
On us plus owners I also understand that there is no cooling of the battery itself but it seems to do better as far as heat goes due to the larger number of cells. The 40kw looks hopeful so far with the level off my hope is we see a significant improvement over earlier batteries. If the 40kw holds up that may give hope for Nissan to stay in the EV game.

Doug:

The chemistry of the 40 and 62 kWh batteries are the same, but the architecture of the 62KWh is different.

"In 2018, the big news for the LEAF was a new battery pack with a capacity of 40 kWh (the real value was around 39.5 kWh, and only 37 or less was available). The battery was also much more powerful than previous versions with output power now at 110kW vs. 80kW in the earlier cars.

That extra power carried over to 2019 unchanged, with the new battery chemistry, structure, and module layout. Earlier versions of the LEAFs battery used a Lithium Manganese Oxide cathode material in a Spinel structure. The new 40 and 62kWh kWh battery uses a Lithium Nickel Cobalt Manganese Oxide cathode in a layered structure."

Here is a bit more info on the 62kWh battery in this story about the launch of the LEAF+

Muxsan says that the newer packs continue to have high internal resistance and as a result still suffer from overheating:

https://youtu.be/PEhz6z2Fdl8

Is it just me, or did Nissan reduce the range of the 40 Leaf from 151 to 149 miles?

https://www.nissanusa.com/vehicles/electric-cars/leaf/features/range-charging-battery.html