This is kind of interesting Ed. The first battery pack replacement was at 250,000 miles on a 2015 model.

https://www.youtube.com/watch?v=iuUG6W2lt4g

Follow up video:  https://www.youtube.com/watch?v=nncuYJB462w

I just skipped through about the third middle of the first video. Watched the mechanical part of the replacement, skipped through the fairly long getting the new battery programmed in, then watched the end result. The second video I watched the first part where he answers some of the main questions from the crowd and explains the improvements and results from the newer three year old bigger battery pack.

Just watching an electric car mechanic do his thing. Seems like a pretty sharp guy.