When it recently became necessary to frequently charge twice (or more) daily and there were local destinations that I could barely get there and back, it was clear that I needed a battery pack replacement -- and 24kWh has been sufficient for at least 8 years. Battery capacity bars were now down to 7 @ 72,326 miles.
I called the service dept of Chattanooga East Nissan (where I got the car May 12 2011) to discuss the replacement in person, but everyone was busy and I was asked to leave a message. On second thought I decided to use the available Chat instead, since I could compose my total cost quote request in advance -- giving important details like my Leaf's VIN -- then paste it into chat. I did this maybe a couple days before Thurs morning Jan 16th when I got a call from service rep Jeff saying total cost would be $6366.17. I asked him to let me think it over maybe a few days, but ended up calling him back an hour or so later to tell Jeff to go ahead. He told me if I could prepay the parts, the new pack could be installed quicker, so I asked if he could handle me arriving within the hour with a check. "Yes", he could. So after arriving and waiting maybe an hour or two or so for them to check out my Leaf's battery and to do what else was needed, then signing several forms I wrote the check which was EFT processed: the pre-paid parts total was $5436.31. They then ran the paperwork past Nissan, but it was rejected initially as needing a couple more forms for me to sign. One was for agreeing I did not want to keep my old battery pack (as otherwise I would have to pay a $1000 additional core charge).
On Wed morning Jan 22 about 8:30 Jeff called to say the pack and all other needed parts had arrived, and they were ready to do the work any time that day and that the pack replacement would take about 4 hours or so. I arrived at the service dept with my Leaf by 9:30, and opted to wait there. They finished the work after about 4 1/2 hours, but wanted to charge the battery about another 1 1/2 hours before I left for home.
The following are the parts used for my 2011 SL Leaf (my understanding is that only the pack and the last two listed parts should be necessary for 2013+ MY 24kWh battery replacement):
295B0-9RB9E - Battery Assy Main - $4588.98
740D0-3NF1A - Bracket Assy (2) - $86.32
297C1-3NF0A - Disconnect Switch - $96.54
01125-N0111 - Bolt (10) - $2.13
748N2-3NF0A - Battery Splash Cover - $33.82
748N3-3NF0A - Battery Splash Cover - $22.48
744J7-5SB0A - Frame Plate (2) - N/C
01456-00031 - Screw (4) - N/C
Parts Sales Tax - $500.55
Parts Total - $5436.31
Labor - $831.88
Environmental Disposal/Shop Supply Fee - $54.95
Labor Sales Tax - $82.04
Labor Total - $968.87
Grand Total - $6405.18
I don't know what the new warranty is, I did not ask (as it is unlikely to be useful to me).