The 40KWH Battery Topic

[knightmb]

My wife is now months into the +83% SOH and still has yet to drop a bar. Nissan must have reworked how they drop bars after 2018 I guess? :?

 

[rogersleaf]

Past 65,000 miles.
Nothing spectacular happening...

LS stats:
AHr... 102.97
SOH... 89.20%
Hx... 95.94%
SOC... 96.9% and 441 GID
402.47v, cells balanced between 4.191-4.194v
odo... 65,114
43 QC / 1626 L2’s

70,000 mile figures:

LS stats:
AHr... 100.87
SOH... 87.38%
Hx... 88.86%
SOC... 96.7% and 431 GID
403.54v cells balanced between 4..202 and 4.205v
odo... 70,687
43 QC / 1771 L2’s

Now passing 76,000 miles. Car & battery seems to be stable and working fine. Likely just intuition, but sense the battery capacity is more sensitive to the cold than prior Winters. Thus far it hasn't affected the car's utility for my needs but noticing the usable range is dropping off much faster on those colder days. It's definitely not being left outside this Winter.

LS stats:
AHr... 100.93
SOH... 87.47%
Hx... 91.42%
SOC... 96.2% and 429 GID
402.06v cells balanced between 4.186 and 4.190v
odo... 76,078
43 QC / 1937 L2’s

Passing 80,000 miles and 4 years, 1 month service

LS stats:
AHr... 100.19
SOH... 86.79%
Hx... 88.69%
SOC... 96.2% and 426 GID
403.53v cells balanced between 4.202 and 4.205v
odo... 80,318
43 QC / 2181 L2’s

 

[SpaceCadet]

From what I've read, I get the impression that it's best to keep the battery between 20% and 80% if possible.

It looks like I'm getting upgraded to a 40kWh battery pack from my depleted 30kWh. I expect to use about 12-15 kWh per day on my commute. I only have a level-1 charger that seems like it runs at around 1.5-1.8 kW and I only charge from 9PM-6:30AM weekdays, so that's pretty much my 15 kWh commute back in every day.

Does this look like a good schedule (SOC)?

Monday 100% > 63% No charging
Tuesday 63% > 25% Recharge
Wednesday 63% >25% Recharge
Thursday same
Friday same
Saturday 25% idle
Sunday Recharge to 100%

The ambient air temperature range is 60-70F outside and in the garage pretty much year-round.

 

[LeftieBiker]

The one modification I would suggest would be to charge to maybe 40-50% on Saturday, in case you need the car for an emergency. 25% isn't enough of a reserve...

 

[SpaceCadet]

The one modification I would suggest would be to charge to maybe 40-50% on Saturday, in case you need the car for an emergency. 25% isn't enough of a reserve...

Okay, thanks. I've got the charger routed through a high-wattage smartplug (I blew out a low-wattage one with the PacHy) so I'll fiddle with on/charging times on the weekend so that it bumps up to 50% Friday night in case I want to drive it somewhere during the weekend.

Should I go to 100% every Sunday night, or should I aim for 70-80% instead? I noticed someone else mentioning that they do a full recharge occasionally. How often should I do that? Weekly? Monthly? Not at all?

 

[LeftieBiker]

A full charge occasionally can help the car keep better track of its charge, and if any battery cells are seriously out of balance, it can, within limits, help to balance them. Once a month should be fine. Be sure to time the charge so that you'll be driving the car not long after it reaches 100%.

 

[giony]

I have a ZE1 tekna from 07/2019 and I am having the intermittent black screen on the reverse camera, usually after opening/closing the trunk.
I want to check for a loose cable, is there a guide on here someone can point me to to remove the trim on the trunk?
Thanks

 

[cwerdna]

Interesting that this heavy 40 Leaf driver (180K KM and counting with 12 bars) feels the GOM and range are better than what the SoH shows (~83.5%) on LS.

Certainly all anecdotal, but I have been feeling that way this summer as well with both Leafs still showing well above EPA, and able to cover epa ranges or better at highway speeds, in spite of SoH on my cars being down 7ish %. Total gids and aHr seems to be in line with SoH though.

https://youtu.be/mqzkONn5Ugo

Thank you.

I took a look at some videos on his channel at https://www.youtube.com/@EV164HIROSHI/videos. Might be the same guy as at https://www.facebook.com/groups/NissanLeafOwners/posts/6171238312974106 who posted 258K km and SOH is 80.6%.

 

[jmurtagh13]

Date SOH HX AH Miles % change
2020-10-10 89.64 112.66 103.48 22791 -0.96
2020-11-10 89.59 111.36 103.43 23479 -0.05
2020-12-10 89.56 111.23 103.39 24225 -0.03
2021-01-10 88.84 111.56 102.56 24686 -0.72
2021-02-10 88.82 111.66 102.53 25230 -0.02
2021-03-10 88.79 111.34 102.50 25667 -0.03
2021-04-10 88.76 111.01 102.46 26174 -0.03
2021-05-10 88.72 110.63 102.42 26615 -0.04
2021-06-10 88.63 111.52 102.31 27308 -0.09
2021-07-10 89.59 112.49 103.42 28112 0.96
2021-08-10 89.49 113.08 103.30 28250 -0.10
2021-09-10 89.37 112.78 103.17 29090 -0.12
2021-10-10 89.79 111.18 103.65 29739 0.42
2021-11-10 89.74 109.81 103.60 30643 -0.05
2021-12-10 89.71 110.17 103.56 31383 -0.03
2022-01-10 89.25 110.64 103.03 32086 -0.46
2022-02-10 89.24 111.12 103.02 32823 -0.01
2022-03-10 89.20 111.35 102.97 33644 -0.04
2022-04-10 88.32 111.55 101.96 34491 -0.88
2022-05-10 88.26 110.64 101.89 35160 -0.06
2022-06-10 88.15 111.33 101.76 36201 -0.11
2022-07-10 89.03 111.17 102.78 36808 0.88
2022-08-10 88.86 110.69 102.58 37900 -0.17
2022-09-10 88.75 109.81 102.45 38837 -0.11
2022-10-10 89.25 108.46 103.03 39620 0.50
2022-11-10 89.19 107.28 102.96 40640 -0.06
2022-12-10 89.16 106.85 102.93 41548 -0.03
2023-01-10 89.20 107.26 102.97 42420 0.04
2023-02-10 89.17 107.31 102.94 43182 -0.03
2023-03-10 89.14 107.15 102.90 43373 -0.03
2023-04-10 89.11 105.62 102.88 44000 -0.03
2023-05-10 89.05 104.99 102.80 44563 -0.06
2023-06-10 88.96 105.52 102.70 45514 -0.09
2023-07-10 89.43 105.93 103.26 46305 0.47

The battery health has been basically flat since October 2020. The car is just past 5 years old with a loss of about 10.5%. The plan is to keep it another 5 years. I think it's really doing well here in hot Atlanta with no active battery cooling. It's just used for local driving, no DC charging. Generally I charge to 75% and then keep it above 20%.

 

[hornstudio]

September 2018
AHr... 98.70
SOH... 85.50%
Hx... 48.55%
odo... 58720
13QC / 1558 L1/L2

I have 3 weak cell pairs when VLBW.

What does this low Hx 48.55% mean?!

 

[GerryAZ]

I believe the low Hx is indicative of increasing internal resistance. The Hx value on my 2019 SL Plus (62 kWh battery) with a little over 68,000 miles is down to about 70% and I can tell by the voltage sag under full acceleration when the battery is low and the amount of battery heating from charging and highway driving that the internal resistance is a bit higher than when new (not unexpected and not bad).

 

[DougWantsALeaf]

Not sure why, but it seems like long highway drives (hours) help keep the hx up.

 

[Stanton]

September 2018
AHr... 98.70
SOH... 85.50%
Hx... 48.55%
odo... 58720
13QC / 1558 L1/L2

I have 3 weak cell pairs when VLBW.

What does this low Hx 48.55% mean?!

Would be more worried about the "3 weak cell pairs". Can you post a LS screen shot or at least list the voltage deltas for the pairs you consider "weak"?

 

[hornstudio]

Can I insert a screen shot from LeafSpy directly from my phone? Does not seem so?

 

[LeftieBiker]

You have to upload the photo(s) to a hosting site like Imgur, then link them here.

 

[hornstudio]

Ouch. Somebody please give me his email adress, I will send him all screenshots to show here!

 

[user 24513]

Someone on the Soltwerra forum (of which we are now members!) asked what the metrics are for LeafSpy to determine battery SOH. Anyone want to weigh in? I had no good replies.....

 

[LeftieBiker]

LeafSpy basically reads values that Nissan programmed the controller to report. It isn't known for a FACT what any of them mean, but it's been determined by people here that there is a very good correspondence between some of those mysterious values and things like SOC, SOH, cell voltages, etc .

 

[aneesh84]

From what I've read, I get the impression that it's best to keep the battery between 20% and 80% if possible.

It looks like I'm getting upgraded to a 40kWh battery pack from my depleted 30kWh. I expect to use about 12-15 kWh per day on my commute. I only have a level-1 charger that seems like it runs at around 1.5-1.8 kW and I only charge from 9PM-6:30AM weekdays, so that's pretty much my 15 kWh commute back in every day.

Does this look like a good schedule (SOC)?

Monday 100% > 63% No charging
Tuesday 63% > 25% Recharge
Wednesday 63% >25% Recharge
Thursday same
Friday same
Saturday 25% idle
Sunday Recharge to 100%

The ambient air temperature range is 60-70F outside and in the garage pretty much year-round.

You should not be making deep discharges for max longevity. Just charge to 75% daily irrespective of how much you drive. No need to charge to 100%. cells get balanced with every charge , they dont need 100% charging which is more stressful.

 

[aneesh84]

Date SOH HX AH Miles % change
2020-10-10 89.64 112.66 103.48 22791 -0.96
2020-11-10 89.59 111.36 103.43 23479 -0.05
2020-12-10 89.56 111.23 103.39 24225 -0.03
2021-01-10 88.84 111.56 102.56 24686 -0.72
2021-02-10 88.82 111.66 102.53 25230 -0.02
2021-03-10 88.79 111.34 102.50 25667 -0.03
2021-04-10 88.76 111.01 102.46 26174 -0.03
2021-05-10 88.72 110.63 102.42 26615 -0.04
2021-06-10 88.63 111.52 102.31 27308 -0.09
2021-07-10 89.59 112.49 103.42 28112 0.96
2021-08-10 89.49 113.08 103.30 28250 -0.10
2021-09-10 89.37 112.78 103.17 29090 -0.12
2021-10-10 89.79 111.18 103.65 29739 0.42
2021-11-10 89.74 109.81 103.60 30643 -0.05
2021-12-10 89.71 110.17 103.56 31383 -0.03
2022-01-10 89.25 110.64 103.03 32086 -0.46
2022-02-10 89.24 111.12 103.02 32823 -0.01
2022-03-10 89.20 111.35 102.97 33644 -0.04
2022-04-10 88.32 111.55 101.96 34491 -0.88
2022-05-10 88.26 110.64 101.89 35160 -0.06
2022-06-10 88.15 111.33 101.76 36201 -0.11
2022-07-10 89.03 111.17 102.78 36808 0.88
2022-08-10 88.86 110.69 102.58 37900 -0.17
2022-09-10 88.75 109.81 102.45 38837 -0.11
2022-10-10 89.25 108.46 103.03 39620 0.50
2022-11-10 89.19 107.28 102.96 40640 -0.06
2022-12-10 89.16 106.85 102.93 41548 -0.03
2023-01-10 89.20 107.26 102.97 42420 0.04
2023-02-10 89.17 107.31 102.94 43182 -0.03
2023-03-10 89.14 107.15 102.90 43373 -0.03
2023-04-10 89.11 105.62 102.88 44000 -0.03
2023-05-10 89.05 104.99 102.80 44563 -0.06
2023-06-10 88.96 105.52 102.70 45514 -0.09
2023-07-10 89.43 105.93 103.26 46305 0.47

The battery health has been basically flat since October 2020. The car is just past 5 years old with a loss of about 10.5%. The plan is to keep it another 5 years. I think it's really doing well here in hot Atlanta with no active battery cooling. It's just used for local driving, no DC charging. Generally I charge to 75% and then keep it above 20%.

Just charging to 75% makes wonders. If you can do that daily to keep low depth of discharge , its the best. Do you keep your car in a garage?