Thanks for the replies and the link to the tips and tricks. I took a break from this forum out of my initial frustration of having my post removed. I understand that happened as a result of some glitch.
Since that post I did take my Leaf to a local Nissan dealership in the Twin Cities to get a quote for a new battery pack. The short version of the story is:
1) A new warrantied traction battery is $8800 installed.
2) I found out my Leaf had an extended warranty and Nissan would have covered the full cost if I had taken my Leaf into the dealership 9 days sooner.
3) After making a case for my Leaf with Nissan Consumer Affairs, Nissan declined to do anything for me.
I am not bitter amount the extended warranty outcome because that was a surprise. However, considering the dealership has a used 2017 Leaf at an asking price that is less than my quoted repair, I do not think that Nissan is doing much to support their customers.
I hope other owners of used Leafs will utilize what I learned the hard way to investigate if Nissan will cover a battery replacement for free. Even if it seems the Leaf is too old, there may be a transferable extended warranty in play.
As of now I am going to take the advice to see how things go this winter without taking any action on the battery.
2012 SL; 73,111 mi, 65% SOH, $3500 (w/charger)