This might belong in a different subforum than "fossil fuel free" but I will leave that to the mods.
I look at used electric car "for sale" ads on Craig's List quite a lot. The Leafe is one that I am specifically tracking. Since the new gen came out prices for the older ones have dropped quite a bit. In fact depreciation on these cars is brutal. Here is a remarkably good (on paper) 2011 Leafe with a relatively new dealer-installed battery. Just 62k miles and very clean looking too, but it has lost nearly 4/5 of its original value in 5 years:
2011 Nissan Leaf SL 4-Door Hatchback
It is a good deal, eh? But...
What would you check for in shopping for a used Leafe? Battery pack health would be checked how? What other issues are known?