Our lead story in today's INSIDER revealed engineers' attempts to power an electric car with removable, rechargeable battery modules. The potentially game-changing technology, however, faces challenges. The modules weigh 20 to 30 pounds, and no infrastructure currently exists for users to lease or purchase the rechargeable devices, for example. The engineers, however, say that they expect the battery technology to mature and shrink in size, and that exchange stations could easily be gradually deployed. What do you think? Are rechargeable battery modules viable?