LeftieBiker wrote: You may have the lowest degradation we've seen, by a small margin. 5% a year would be tolerable for me.
It's the sudden drops every three months that worry me. Without them my degradation has been fit perfectly by a double-linear trend, losing 3aHr/10,000 miles for the first 6,000 miles, and less than 1aHr/10,000 miles after that. If that was all there was to it, I would have only 13% degradation after 8 years and 120,000 miles. If I include those drops, then it looks like I would have 30% degradation over those 8 years. However, I notice that the amplitude of the drops is decreasing each time: the first one was 2.25 aHr, the second 1.4 aHr, and the last one was 1.0 aHr. If they keep to the past pattern, I expect to see another drop this week or next, so we'll see if the amplitude really does keep decreasing.
One thing I should note is that we don't baby the battery. My wife primarily drives the car during the week, and she likes to have a full battery every morning, so we almost always charge to 100% in the evening. We also take our Leaf on long trips in the summer, and when we do we have to "quick" charge multiple times in a day. It is pretty frustrating to get only ~22kW from the second charge and ~18kW from the third or fourth! Given the substantial degradation just with time, and no apparent correlation between those fast charges and measurable degradation, I would really like to get the software fix for #rapidgate over here.