The 40KWH Battery Topic

[DaveinOlyWA]

I think you would need a lot more samples, in controlled environments, to really be certain. Otherwise is speculative.

That sums it up!

Oh yeah, we can wait for that to happen.

 

[danrjones]

I'm done with my pack adjustment. Given the cool temps I've had the last three months, the low miles, and what I believe is gentle battery treatment, I'm quite surprised how big the adjustment was. I fully expect to dive into the 80's and loose my first bar this summer. My car is degraded basically 10% in 10 months of ownership. Next adjustment should be around June 11th. I'm just under 4800 miles.



Date SOH AMPHr Hx
05/03/2019 97.63 112.70 97.50
06/13/2019 97.42 112.46 101.25
06/14/2019 96.49 111.39 101.58
06/15/2019 96.28 111.15 101.58
06/16/2019 95.64 110.41 101.67
06/17/2019 95.42 110.15 101.82
06/19/2019 95.40 110.13 102.15
09/11/2019 94.64 109.25 106.48
09/12/2019 94.50 109.09 106.47
09/13/2019 93.73 108.20 106.48
09/14/2019 93.30 107.71 106.45
12/10/2019 93.11 107.49 106.14
12/11/2019 92.90 107.24 106.10
12/11/2019 92.76 107.08 106.10
12/12/2019 92.34 106.60 106.12
12/13/2019 92.13 106.35 106.10
12/14/2019 91.78 105.95 106.09
02/28/2020 91.72 105.88 107.13
03/13/2020 90.24 104.14 107.87

 

[DougWantsALeaf]

Do you feel the range has also come down 10%?

 

[danrjones]

That's really hard to answer because 99% I drive my car only around town. I did a couple road trips a few weeks back to check near-bye locations they are suppose to be installing fast chargers, and using ABRP with battery set at 9% degradation seemed to match my REAL range and SOC almost exactly. So that is minimal evidence but the answer might be yes.

 

[nightleaf]

wow......I was not expecting a significant drop from last month.... but it looks like i am now in the below 90 group...

I might just start charging to 100 whenever I can as it does not seem t make much difference charging only to 80...

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
Feb 13, 2020 - Km; 42114 Ahr; 104.99 SOH; 90.95
Mar 18, 2020 - Km; 43953 Ahr; 103.00 SOH; 89.22

 

[Anonymous]

Hard to believe, given the timing, but it seems the 40 kWh pack is the worst one Nissan has made (save the first-gen 24).

 

[LeftieBiker]

Could be, although when you look at the 30kwh pack, many of those are worse. Ironically, the best thing about the 30kwh "Lettuce Pack" is that it's being replaced when under warranty by the 40kwh... Cabbage Pack?

 

[Anonymous]

Could be, although when you look at the 30kwh pack, many of those are worse. Ironically, the best thing about the 30kwh "Lettuce Pack" is that it's being replaced when under warranty by the 40kwh... Cabbage Pack?

Do you actually get 40 kWh of usable range with the upgrade?

 

[LeftieBiker]

Could be, although when you look at the 30kwh pack, many of those are worse. Ironically, the best thing about the 30kwh "Lettuce Pack" is that it's being replaced when under warranty by the 40kwh... Cabbage Pack?

Do you actually get 40 kWh of usable range with the upgrade?

So it would seem. One of our regulars got it. Gale Hawkins...?

 

[DaveinOlyWA]

Do you feel the range has also come down 10%?

Speaking as one who had a 40

Yes, the range was less

No, the range was not as low as EPA yet.

 

[danrjones]

wow......I was not expecting a significant drop from last month.... but it looks like i am now in the below 90 group...

I might just start charging to 100 whenever I can as it does not seem t make much difference charging only to 80...

I was wondering the same thing. you get so much advice on here: Charge to 80%, only charge to 45%, don't fast charge, AC your garage, etc... who knows what really matters, if anything at all.

Here is a chart of my degredation:

 

[DougWantsALeaf]

Does anyone else find it Bizarre how consistent the data is between cars and location with the 40 (and increasingly so 62) batteries in terms of degradation? In the older batteries, we had Canadians with 90's into year 4 or even 5, and Phoenix residents with 11 bars after a year.

This round seems to be impervious of climate, and just marches down with time. Its almost like the BMS is trying to glide the battery into just miss the 70% in 8 year mark.

 

[lorenfb]

Does anyone else find it Bizarre how consistent the data is between cars and location with the 40 (and increasingly so 62) batteries in terms of degradation? In the older batteries, we had Canadians with 90's into year 4 or even 5, and Phoenix residents with 11 bars after a year.

This round seems to be impervious of climate, and just marches down with time. Its almost like the BMS is trying to glide the battery into just miss the 70% in 8 year mark.

Let's avoid guessing without more data, i.e. 2-3 years.

 

[danrjones]

Does anyone else find it Bizarre how consistent the data is between cars and location with the 40 (and increasingly so 62) batteries in terms of degradation? In the older batteries, we had Canadians with 90's into year 4 or even 5, and Phoenix residents with 11 bars after a year.

This round seems to be impervious of climate, and just marches down with time. Its almost like the BMS is trying to glide the battery into just miss the 70% in 8 year mark.

Let's avoid guessing without more data, i.e. 2-3 years.

I think I'll know a lot more about my pack after subjecting it to a brutal baking this summer.

 

[goldbrick]

What I'd like to know is how well the SOH as read and decoded by LeafSpy actually matches the battery capacity loss. The curves do seem eerily consistent and I think everyone would agree that the pack doesn't stay inert for 3 months and then lose a bunch of capacity overnight. So something is happening inside the firmware that is a bit odd and to me it just makes the whole SOH reading a bit suspect.

 

[lorenfb]

At 10.3K miles on my 40kWh Leaf, the key battery parameter is now at 109Ahrs. For those that follow/like SOH (ratio of Ahrs - present/new),
Ahrs at delivery last April were at 115Ahrs, then present SOH=95%.

Approach to minimizing degradation; no QCs, max speed 55-60 MPH, max charge level 80%, min discharge > 15-20Ahrs.

 

[LeftieBiker]

I was wondering the same thing. you get so much advice on here: Charge to 80%, only charge to 45%, don't fast charge, AC your garage, etc... who knows what really matters, if anything at all.

Cooling my garage was an experiment. It largely failed, although since I also have a scooter with Canary pack batteries I'll likely keep doing it for that reason. I run the window A/C a few hours a night in hot weather, on a timer.

 

[DaveinOlyWA]

Does anyone else find it Bizarre how consistent the data is between cars and location with the 40 (and increasingly so 62) batteries in terms of degradation? In the older batteries, we had Canadians with 90's into year 4 or even 5, and Phoenix residents with 11 bars after a year.

This round seems to be impervious of climate, and just marches down with time. Its almost like the BMS is trying to glide the battery into just miss the 70% in 8 year mark.

Let's avoid guessing without more data, i.e. 2-3 years.

Its been two years. How much time do you need? In previous packs, AZ cars left the rest in a few months. Southern tier states barely took a year and in many cases less.

 

[lorenfb]

Does anyone else find it Bizarre how consistent the data is between cars and location with the 40 (and increasingly so 62) batteries in terms of degradation? In the older batteries, we had Canadians with 90's into year 4 or even 5, and Phoenix residents with 11 bars after a year.

This round seems to be impervious of climate, and just marches down with time. Its almost like the BMS is trying to glide the battery into just miss the 70% in 8 year mark.

Let's avoid guessing without more data, i.e. 2-3 years.

Its been two years. How much time do you need? In previous packs, AZ cars left the rest in a few months. Southern tier states barely took a year and in many cases less.

Very little Leaf2 data, e.g. over 25K miles per vehicle, relative to Leaf1 data have been reported.

 

[LeftieBiker]

Very little Leaf2 data, e.g. over 25K miles per vehicle, relative to Leaf1 data have been reported.

Odometer readings have yet to show any correlation to anything other than miles traveled by any of the Leaf packs.