The 40KWH Battery Topic

[Dala]

I checked the stats on the 40kWh I have in storage



2018 / x? model
6 000km
SOH = 95,9%

[golfcart]

Holding relatively steady in the 94.xx% range. After the large drop in May/June I've just been seeing very slow degradation of about 0.2% each month.

Date SOH% SOH %Chg Ahr Ahr %Chg TempF

3/15/19 97.47 -2.53% 112.52 -2.53% 69.1
4/15/19 97.41 -2.59% 112.45 -2.59% 75.2
5/15/19 97.34 -2.66% 112.37 -2.66% 82.2
6/15/19 95.38 -4.62% 110.11 -4.62% 90.8
7/15/19 94.98 -5.02% 109.64 -5.02% 97
8/15/19 94.63 -5.37% 109.24 -5.37% 101.8
9/15/19 94.41 -5.59% 108.99 -5.59% 92.2
10/15/19 94.26 -5.74% 108.81 -5.74% 81

[LeftieBiker]

This is why I've gone to 6 month intervals for LeafSpy: you get the same trends, without having to say, every month, "Another drop..."

[alozzy]

This is why I've gone to 6 month intervals for LeafSpy: you get the same trends, without having to say, every month, "Another drop..."

This! I can't recall the last time I used LeafSpy, at least a year. Just ruins the enjoyment of the car, as there's absolutely nothing good you can do with the information. I charge to 80% most of the time, try to avoid charging when it's hot out, try to avoid deep discharging, otherwise I just drive it.

Same reason I wouldn't want to have a DNA test to find out my life expectancy - sometimes ignorance is bliss

[goldbrick]

This is why I've gone to 6 month intervals for LeafSpy: you get the same trends, without having to say, every month, "Another drop..."

This! I can't recall the last time I used LeafSpy, at least a year. Just ruins the enjoyment of the car, as there's absolutely nothing good you can do with the information. I charge to 80% most of the time, try to avoid charging when it's hot out, try to avoid deep discharging, otherwise I just drive it.

Same reason I wouldn't want to have a DNA test to find out my life expectancy - sometimes ignorance is bliss

+1 I've been charging to 60% during the summer and now I'm a bit less careful but I still try to keep it under 80%. I did just check LeafSpy a few weeks ago and I'm at around 94% SOH but I was as low as 92% in the first 6 months before the BMS update on my 2017 S. My LBW still comes on at 14% and I have no noticeable loss of range The dash says I get 4.9 m/kWh so everything is just dandy for me. I've also stopped worrying about using the heat (S model....) and just make myself comfortable.

Switching to an EV does take some mental adjustments but I think at this point I'm over the hump and knowing my remaining range is taken care of subconsciously. Fortunately, I don't need to do long drives and there is FREE! charging all over town so that makes EV driving very low stress for me. I still like to take the occasional 'adventure' to see if I can make a longer trip in the Leaf but that is an exception. Most of my driving is just around town and the car has been perfect for that so far.

[LeftieBiker]

I think I did get useful information from monthly LS readings - the first year. Now I use that info and just see if the drop decelerates with my car as it seems to with others after one year. I don't need monthly readings for that.

[golfcart]

I’ve only had the car for 7 months so in just checking monthly and posting for informational purposes. Plus there were some theories posted about large drops occurring every 3 months and I wanted to see if they hold water.

[SageBrush]

I think I did get useful information from monthly LS readings - the first year. Now I use that info and just see if the drop decelerates with my car as it seems to with others after one year. I don't need monthly readings for that.

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I still read once a month to correlate transient SOH changes with battery temp. For long term degradation once a year readings are enough, and probably preferred to reduce seasonal noise. If fact, I think it better to take a baseline at one year and then yearly.

[coleafrado]

I think I did get useful information from monthly LS readings - the first year. Now I use that info and just see if the drop decelerates with my car as it seems to with others after one year. I don't need monthly readings for that.

.
I still read once a month to correlate transient SOH changes with battery temp. For long term degradation once a year readings are enough, and probably preferred to reduce seasonal noise. If fact, I think it better to take a baseline at one year and then yearly.

Do you still have your LEAF? Might be useful to update your signature with newest data.

[golfcart]

I really don't think it matters much, check however often y'all see fit. A long term linear trend line will pretty much get rid of any seasonal noise anyways for our needs we are just looking for overall trends. I just think it is interesting to check, it really isn't a hassle. What does it take? 45 seconds to hook up the dongle and connect with the app?