It is not a matter if it works or not. It is a matter if its current condition and hopefully how it was treated. Nissan includes a free battery test the first few years.
Does it have a cooling system?
There not much to diagnose on the battery. It works or is doesn't.
Sorry, this isn't a "Nissan" product. Of course, it has proper heating and cooling, provided by Tesla. The "free" battery test that Nissan providers from a dealer isn't worth the paper it is printed on. If you want good Nissan battery data, I recommend the several apps that are available.
If you want to estimate degradation on the 2012-2014 Toyota Rav4 EV, I have provided a method to do that:viewtopic.php?p=20518#p20518