Tesla's are the top of the heap in EV and they invested a lot of time and money into battery thermal management. If you follow the charging guidelines properly, your battery should be at 60-80% after 8 years. However that figure does not hold as well for other makes.
The S model became their symbolic real entry in 2012 into the EV market and makes up a good chunk of the used EV market. Current pricing here in Vancouver on S models 2012-2015 is $35,000 to 55,000, which is pretty good return for the 1st owner. The next question is does the 2nd owner get a good resale value? What about the 3rd owner? It's not uncommon for good ICE used vehicles of the same era to be on their 3rd owner with 200,000+ km on them. Of the S models for sale the majority are at or below 100,000km, with one at 192,000 (That person loved their car)
The real value of a EV is in it's battery and that is the factor that determines the life of the car. EV batteries are complex, while not having moving parts, there are a lot of failure points in the design. I will suggest that people who buy a 4x4 EV pickup and use it for wheeling will be shocked at how short their battery life is going to be.
A look inside a Tesla battery