danrjones
Posts: 1000
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

Thu Feb 25, 2021 1:18 pm

In this case I'm just going for simple napkin math.

It sounds like Leafspy might be showing us about 1.5% on both the top and bottom that you cannot use.
So if we take my numbers and then adjust them, we have:

96.7-20.1% = 76.6 -> 76.6/.97 = 78.97% of useable battery

26.31 kWh /.7897 = 33.32 kWh useable battery

Degradation -> 33.32/36 = 92.5%

OR

33.32/38 = 87.6%

Most of the reports I've seen still say it is 36 useable of 40 kWh... so that means my degradation is actually around 92%.
But do I actually believe this math? Not really. Too many assumptions, unknowns and inaccuracies in my data.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

HerdingElectrons
Posts: 207
Joined: Sat Sep 08, 2018 3:20 pm
Delivery Date: 17 Sep 2018
Location: Central Coast, Ca

Re: The 40KWH Battery Topic

Thu Feb 25, 2021 1:33 pm

My recollection is that the 40kWh packs are 40.xx kWh gross & 38.6kWh is what Nissan is allowing for usable capacity. I believe I got that from a video Q&A session when the 2018 Leaf was being released that I believe Cwerdna linked to but I will have to do some digging to see if my memory is accurate
2018 SL Pearl White 4.5/3.9; 5.0/4.6 with 205/65/16 tires)

09/18-01K Mi: 114.52AHr / SOH= 99.20%
04/19-10K Mi: 111.45AHr / SOH= 96.54%
11/19-20K Mi: 107.44AHr / SOH= 93.07%
12/20-33K Mi: 105.39Ahr / SOH= 91.29%
04/21-35K Mi: 104.32Ahr / SOH= 90.37%

LeftieBiker
Moderator
Posts: 16654
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Thu Feb 25, 2021 1:33 pm

Most of the reports I've seen still say it is 36 useable of 40 kWh... so that means my degradation is actually around 92%.
Hopefully you mean 8% degradation, 92% remaining capacity.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

danrjones
Posts: 1000
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

Thu Feb 25, 2021 3:43 pm

LeftieBiker wrote:
Thu Feb 25, 2021 1:33 pm
Most of the reports I've seen still say it is 36 useable of 40 kWh... so that means my degradation is actually around 92%.
Hopefully you mean 8% degradation, 92% remaining capacity.
Yes sorry, that was suppose to be implied by the math.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

sptleaf
Posts: 24
Joined: Sun Feb 17, 2019 10:57 pm
Delivery Date: 18 Feb 2019
Location: San Diego

Re: The 40KWH Battery Topic

Mon Mar 08, 2021 10:14 am

2 year update on my 2019 Leaf S

Date SOH Ahr Hx Odo # L1/L2 Days Loss
3/8/2019 99.39% 114.74 104.14% 649 24 0
3/8/2021 91.80% 105.97 94.66 12700 481 731 7.59%

when I was commuting, I would charge to 100% and not even worry about it. This last year I have let it sit without driving much at about a 70% charge. Garaged in So Cal, no Quick Charge port.

danrjones
Posts: 1000
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

Mon Mar 08, 2021 1:07 pm

My 2018 skipped its last 3 month update (would have been Dec 7th)

Checked at lunch today and sure enough, its going through an update. So even with the skipped update in December, the next update is right on the 3 month schedule. The last update was in September, and SOH went up. Now its taking away what it gave me.

As of lunch today:
SOH: 89.37
AMPHr: 103.17
Hx: 102.81

~9200 miles.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

DougWantsALeaf
Posts: 2593
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: The 40KWH Battery Topic

Tue Mar 09, 2021 12:59 pm

Here is a 12 bar 100K mile 40kWh Leaf.

https://youtu.be/bmcJbvmeXcM

Interestingly, he is under 85% SoH. While close, I have seen now a few places where someone is at 83-84% but still showing 12 bars. Either Nissam expanded the top bar a bit, or there is in fact a small hidden buffer.

Oddly, I am excited to see our first verified 11 bar 40kWh Leaf to understand what SoH is at that change.
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh

DaveinOlyWA
Posts: 15569
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: The 40KWH Battery Topic

Thu Mar 11, 2021 9:28 am

DougWantsALeaf wrote:
Tue Mar 09, 2021 12:59 pm
Here is a 12 bar 100K mile 40kWh Leaf.

https://youtu.be/bmcJbvmeXcM

Interestingly, he is under 85% SoH. While close, I have seen now a few places where someone is at 83-84% but still showing 12 bars. Either Nissam expanded the top bar a bit, or there is in fact a small hidden buffer.

Oddly, I am excited to see our first verified 11 bar 40kWh Leaf to understand what SoH is at that change.
Not un normal for the first bar to leave at 83 something percent. What is his % of ahr? Looks like he is 84.9% of his original ahr (using 115) so, he is close. Guessing nothing will happen until its a bit warmer.

Rather see his history. Obviously not linear but what has he lost in last 2 years? Last year?
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 16,686 mi, 91.51% SOH
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danrjones
Posts: 1000
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

Thu Mar 11, 2021 12:59 pm

danrjones wrote:
Mon Mar 08, 2021 1:07 pm
My 2018 skipped its last 3 month update (would have been Dec 7th)

Checked at lunch today and sure enough, its going through an update. So even with the skipped update in December, the next update is right on the 3 month schedule. The last update was in September, and SOH went up. Now its taking away what it gave me.

As of lunch today:
SOH: 89.37
AMPHr: 103.17
Hx: 102.81

~9200 miles.
My adjustment is taking its time. Still going down as of lunch today.

SOH: 88.03%


This has been a big adjustment. I'll be blunt, I'm glad I'm getting rid of it later this year. I don't really want to try and sell it with a bar missing.
Whether the real battery degradation is 12% I don't know. I've treated the battery and car about as well as possible, except the hot summer ambient temps here. Would imagine missing a bar would make resale harder.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

DougWantsALeaf
Posts: 2593
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: The 40KWH Battery Topic

Thu Mar 11, 2021 1:21 pm

I wish Nissan would publish their BMS algorithm. I don't know what drives the large drops beyond general age.

My SoHs are stable right now, but I do get nervous with each quarterly update. 6 down and 3 up so far. The downs are always worse than the ups. Next quarterly for the S+ is this week...holding my breath. My charging regimen is now DC charging only on a trip when needed (sad for my NCTC), keep battery between 30% and 70% unless driving far.

https://drive.google.com/file/d/1xzcLfY ... p=drivesdk
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh

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