Most electric cars are pretty much computers on wheels, and voltages, currents and temperature are constantly monitored. It totally should be possible to log battery health and diagnostic information and generate a battery health report for when the vehicle is sold. But standards would need to be put in place for that to force manufacturers to implement it and to make sure the results are actually meaningful.

Unfortunately Tesla’s specifically really don’t feel like they’re designed to last when looking at their materials choices and build quality (either that or my manager just bought a particularly bad sample, I have to admit it’s the only Tesla I ever been inside of) so I don’t think having a good reseller experience or longevity is really a part of their business model.