Some people have reported a slight increase of their rated range display after charging beyond 90%. This can be explained in different ways. It might be balancing, it might be just recalibrating the capacity algorithm as Tesla officially said it would. If the Leaf balances it's batteries at any time (while driving, charging or just sitting), I would assume Tesla would be limiting it to just near 100% charging. The size of the resistors found in the Tesla battery are too small to do any significant balancing in a short amount of time, thus a more continuous approach would be more likely.