As has been said over and over effectively there is no 30 kWh battery warranty in play until AFTER the BMS update is performed at a Nissan Leaf shop.
Due to this fact having the BMS update applied ASAP seems to be in order in light of the fact Nissan seems to be putting all options on the table to prevent total failure and that was pre COVID-19. Consider using a Nissan Leaf authorized shop that has replaced at least one Leaf battery pack since they have been in business.
We got our 2016 Leaf SL that had been sold 38 months earlier in Oct 2019 showing 9 SOH bars. I 'assumed' the BMS update had not been ran since it only had 21.5K miles on the car that seemed to have lived in the St. Louis MO area per records.
Five weeks after I bought it the 4th bar was lost. When I started looking for a dealership to run the BMS update I realized Nashville TN was not a hot spot for Leaf service so at the advice of a service writer in Nashville I called the Nissan Leaf national hotline.
Starting at the national level for my battery warranty was key to getting a new battery in our case. I told the rep I had lost the 4th bar and was looking for a dealership to run the update. That was when I was told the lessee had complained about low range in 2018 and the BMS update had been ran at that time so I was due a new battery if a Nissan Leaf service center would report what I was reporting to be factual.
Why the warranty was triggered at only 24K miles I do not understand. It reported only 1 DC charge.
I finally found a dealership 70 miles away so since my range was down to 60 miles I rented a U-Haul car trailer and dropped it off 30 Dec 2019 and picked it up 12 Feb 2020. After a few weeks of hassle (being told I had a valid claim but that the Memphis division was looking at options other than replacing the failed battery) I called up the national rep and was told not to worry. A couple weeks later without me talking to the dealership service center I learned my car now had the 40 kWh new battery installed and tested ready for my pick up.
If one thinks they may some day have a Leaf battery warranty claim keep track what is going on in Japan corporate wise.
The Leaf is the nicest car that I have owned. It is the 6th Nissan that I have owned since 1973 but the first one without a gas tank. Going from a range of 60 miles to 150 miles is HUGE. Best of success in the global melt down.