Nissan retroactively offered the capacity warranty that came standard on 2013 models to registered owners of 2011 and 2012 models months before the class action suit documents were sent to those same owners by the plaintiff attorneys. Nissan actually replaced the battery in my 2011 before the first proposed settlement went to court. That proposed settlement was rejected by the court because it would have done little for most owners. The revised settlement which was ultimately approved by the court required the replacement batteries for 2011 and 2012 models (covered by the class action) to be of the latest chemistry, but owners accepting the settlement waived their future rights to sue Nissan over battery issues. The settlement was a big win for Nissan and the plaintiff attorneys at the expense of the owners. I opted out of the original proposed settlement and remained opted out of the final settlement, but it became a moot point since the car was totaled before I had any more battery issues.
Edited to clarify that class action only applied to 2011 through 2012 models and fix a typographical error.