Capacity Loss on 2011-2012 LEAFs

[garygid]

Also, how does one get the Cell-Pair voltages
and the internal resistance readings at the dealer?

[EdmondLeaf]

Anyone here to lend SOC meter for a week or so?

[smkettner]

How many battery temperature bars during the long 100% storage?
Are you at the top of the battery temp scale when you top off?

[azdre]

How many battery temperature bars during the long 100% storage?
Are you at the top of the battery temp scale when you top off?

I've never seen anything unusual with the battery temperature. Mid-range always. I was out of state for the month of storage, so I have no way of knowing what the battery temperature was during that time. I'm also not sure that it was at 100%, it could have been less, it wasn't really a priority for me at the time. We were told the car could handle the storage, and when we came back it had lost next to nothing. We did remove it from the Blink, because at the time, the Blink was pretty buggy and didn't want the car attached to it unattended for such a long time.

It was a very mild May last year, so in the garage it probably got no warmer than 90 degrees during the worst day.

[LEAFfan]

Azdre, I have an SoC gauge. Just let me know if you want to use it to check your SoC%.

[EVDRIVER]

If your car was at 100% and unplugged for a month it did not sit at 100% for the entire month. Do you remember the SOC when you checked it at the end of that month? Regardless if sat at 100% a long time. I suspect those in cool climates will have much longer pack capacity life.

[TRONZ]

What is the recommended SOC level for going on a vacation??? We will be away for a week next month and I was thinking of just parking it at about 60%.

[surfingslovak]

We will be away for a week next month and I was thinking of just parking it at about 60%.

TRONZ, that should be fine. Be sure to unplug the car though, and try to park it somewhere where it doesn't bake in the hot sun all day.

[adric22]

Everybody should keep something in mind.. I do not believe the energy loss of the battery is linear. For example, if you loose 10% the first year then you may have lost 10 miles of range. But if you loose another 10% the next year, you would loose another 9 miles, the next year you'd loose maybe 7 or 8. You get the idea. I'm not saying this is exactly how it works, but I wouldn't expect to loose 15 miles of range every year. If you did, the battery would be completely dead in 6 or 7 years... But would be nearly unusable long before that.

Of course, at some point or another, you'll have a cell or two that just flat out die, then the car will quit working.

I've also wondered about how the Leaf measures capacity loss. For example, if you are now at 85% total capacity, then does that just mean the weakest cell in the pack is at 85%, but other cells may be higher?

[klapauzius]

we have bunch of forum members with similar mileage/age, so this seems to be somewhat unusual. Or we will see a string of more posts like this pop up in the near future?
It would be nice to make a list, where we systematically collect data on this. I.e. age of the battery at first bar loss, mileage, average high (summer) storage temperature and charging habits (i.e. 80%/100%).

it seems to me that Nissans battery health test is pretty meaningless, if a case like this would still show up as 5 stars? I dont want to know what the loss rate of a 4 star or less test would be....In any case, I am still hoping this is an outlier, but it leaves an unpleasant feeling. Adding to range anxiety, we now have capacity anxiety as well...seems like EVs are not for those faint of heart