You've hit on one of many problems, though some sort of recycle mandate (yeah more big brotherism) will appear to solve that issue, though will further increase the real cost and inconvenience. What almost never gets addressed is the material the batteries will likely be made from. Generally known as "rare earths". These need to be mined (we know how popular that is with the enviro whackos), often in unstable geographies, and in limited supply. Will the "carbon costs" of the mining, refining, transportation, etc. be calculated in the "greener" formula? Is there enough material available to power the world fleet of cars? Not likely. But they've managed to hide the real costs of ethanol, so this will likely be obscured the same way. The real main objective is subjugation of the populace, but of course that can't be admitted. Sigh!