I wanted to report this in case others are in the same boat I was.
I purchased my used 2011 Leaf in March of 2016. In January of this year, I decided to get a battery test performed at my local Nissan dealership because I was concerned about the bars I had lost and the battery was only charging to about 60 miles.
The report showed that my battery had degraded to the point that it could have been replaced if it was still under warranty. However, I had miscalculated when the warranty expired. It actually expired last October, based on when my Leaf was originally sold.
The dealership advised me that they would see if Nissan would replace the battery anyway under their "Goodwill" program. The service tech turned the paperwork in to Nissan and a few days later called me and said they would replace if if I paid $600 for the installation.
I gladly paid the installation charge and the new battery was installed yesterday. It now charges to 120 miles.
The one thing I'm not sure about is the warranty on the new battery. The dealership told me it was only 12 months/12,000 miles, but I'm wondering what others have been told who have had their batteries replaced under Nissan's "goodwill" program?
Also, are the replacement batteries significantly better than the original battery?
In any event, I'm very happy about the outcome and wanted to let others know about my experience.