If you look at the bottom of page 8 of this topic, you'll find a mini-guide to the Gen II. I'll also copy & paste it here now:
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I really need to write up a guide for the Gen 2, but in short:
* There were a significant number of bad or weak cells in the 2018 Leafs. Use LeafSpy Pro to check the battery of any prospective Leaf. Bad or weak cells will show much lower voltages than the rest of the pack on the voltage histogram chart. LS also gives the maximum difference in voltage between cells. If that voltage is over 50mv, be concerned. Smaller differences are normal.
* The 2018 Leaf has more issues with Pro Pilot than do later model years. The front radar units can ice up or fail from exposure to a lot of moisture. Nissan only replaces them when they throw error codes.
* Starting in, I believe, 2021, the accelerator pedal mapping was changed. Eco mode is now very underpowered, and Normal/D mode is also wimpier. I've gone from driving in Eco 90% of the time to driving in D mode most of the time.
* Starting in 2019 or 2020, the pedestrian warning sound (VSP) was made louder. It bothers some people, sounding a bit like the sonar sounds you hear in submarine movies. It is no longer adjustable/muteable, IIRC.