There is an issue with the 30kwh battery in which it either appears to lose capacity quickly but really only needs the Battery Management System reprogrammed, or in some cases it really does lose capacity fast. Which is the case with your car? You'll have to get the free BMS reprogram, wait a few months, and see if the bar that you will regain stays, or goes away again. As for the warranty on the battery: interesting question with the 30kwh battery...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.