We leased a new 2017 Leaf with a 30Kw battery 9 months ago. The car has less than 9,000 miles and we already lost one cell. Our last Leaf didn't lose a cell until around 25,000 miles. It doesn't do any good to get the extra range battery if the thing is failing within the first 10,000 miles...
Finally had a chance to run the 2014 Leaf to almost zero charge in Phoenix. Went 32 miles on the freeway (31 miles on the freeway, 1 mile off) at 65-68mph with full air in 98-100 degree weather with 3 people in the car. When I got there, I had 50% of the battery left and 37mph on the gauges...