Does anyone know what criteria Tesla uses to judge if there is a fault in the battery of the Roadster, and replace it under warranty? I'm sure most of you guys know that there have been some fairly hefty discussions concerning remaining range after X years, and a part of this discussion is what value the battery warranties offered by car manufacturers actually has. Here at least, Nissan for instance does not cover "gradual capacity loss", so in theory, Nissan does not replace the battery under warranty even if the capacity is at 5% after a week, provided the loss was "gradual". Where does Tesla fit into that? Im sure those of you who've bought a Roadster must have some paperwork outlining the terms of the battery warranty. And I've fruitlessly tried to find this paperwork or references to it online. Personally, I think car manufacturers should develop a standard concering the warranties, so that if a battery is under something like 70% capacity, it is to be replaced under warranty. And then the car manufacturers can set the number of years the battery is covered based on that figure.