Websites to learn about used EVs
 

Hi, I am looking to buy a used EV - maybe Hyundai, VW, or maybe Tesla. Does anyone know a good source for finding useful information on which car to buy.
Before I buy a used EV, I want to learn more about battery life, which MY is a good one to buy, how value of cars are expected to develop, etc.
Would be great if someone here could help me. Thank you!
James