[aerohead]

The next door neighbor follows Tesla.
When those use a Tesla Supercharger station, the car provides telemetry back to Southern California where it's compiled and analyzed.
The word is that, battery life is a matter of charge cycles, and from what Tesla is observing, a Tesla pack will go for a million miles.
I know nothing about any other manufacturer's product.
So, for Tesla, anyway, the battery, if not abused, could go on to perform reasonably for the difference in mileage.