I may want to clarify what I meant, at least from my perspective, when I said there were problems with batteries.
There is lots of charging technology out there, and it all works and works very well. It's just a question of coming to a common approach or a standard for the method. There aren't even defined regulations for the heavy-duty, high-voltage charging that we're dealing with.
As I said, you have some people developing automation to do a rapid exchange, such as a gas station that takes the batteries out and puts them in. We don't really think that's viable. Again, you'll have some people who think that induction charging is the way to go, whereby your charging system is built into the road and there are no wires and nothing to attach. You have some people who say, have it overhead—you come up to a bus stop, and then something comes up and attaches for five minutes and comes down. Again, some people are trying to develop state-of-the-art plug-ins. It's a question of coming to what the best approach is or funnelling it down. If you go to an electric vehicle convention right now, most of what you see is different companies promoting different charging technologies.
So there's lots of battery technology. It continues to improve each year. The metric, I guess, is how much a kilowatt hour costs today. It's almost $500 to $1,000 per kilowatt hour.