It does sound like Nissan has a better idea on the battery pack than some others, where they monitor and service individual lithium cells, but I too wonder the cost of that cell, and how many are carried? When I asked a Chevy dealer about battery replacement and cost his answer was, "We don't know yet, because we have no history." Sorry, but they know their battery cost and can assign a service time to the R&R. The unknowns might be any cost associated with disposal of the depleted cells, which are classified hazardous waste and have to be disposed of accordingly, at least at this time.