I wish I could be as optimistic as some of you are. My 2011 LEAF's battery was swapped at the end of April, so I have about 5-1/2 months of data thus far. Unfortunately, I didn't have a way to track degradation on the original battery until about 2014, so I don't know how quickly it was losing capacity, but looking at my data, it appears that I've already lost about 3.8 AHr (from 66.14 when new to 62.339 now). This represents almost a 6% drop in capacity in about 5-1/2 months, or a bit over 1% per month. If extrapolated, I'd be back down to 66% of capacity in about 34 months! Granted, this will likely not be the case, since the past few months have been the hottest months of the year.
It'll be interesting to see what the degradation will be at the one-year point. Hopefully many of us with "lizard" replacement batteries will contribute their findings to the forum so that we can get a better idea of just how much better the newer chemistry is.
BTW, here's the actual numbers (about 8,000 miles of driving):
- GIDs went from 278 to 270
- AHr went from 66.14 to 62.339
- SOH went from 100% to 97%
- Hx went from a high of 102.30 (about a week after the new battery was installed) to 93.66