I agree that this is a serious limitation to the technology right now, and I hope that this is something that they address in future models. Personally, I think that they should have an optional solar panel that is capable of maintaining at least minimal charge. This is probably the number 2 issue(after price) why these cars aren't ready for the mainstream public yet. How many cars die daily due to people not doing something as simple as changing the oil regularly? And it would take far less negligence to leave the car unplugged.