The Leaf Spy numbers (AHr, SOH, and Hx) typically dropped on my 2015 if it was driven gently and charged with L1 or a low-rate L2 EVSE. The numbers would then improve with highway driving and high-rate L2 or DCQC charging. I did not notice that with the 2011 (original battery chemistry from Japan) and have not yet noticed that with the 2019.