Good point about the cost of the battery. The way I was thinking the battery would be rechargeable and ownership would be retained by the customer. This preclud

Good point about the cost of the battery. The way I was thinking the battery would be rechargeable and ownership would be retained by the customer. This precludes my thought on "button-style" batteries, but I would not be against carrying a rechargeable battery in lieu of a wallet. The second point is really good as well, and after reading it I am thinking that existing Power Plants and grids would transition to a sort of bank where value could be allocated and disbursed like a check or money order. For instance, I am in Pennsylvania and I have a diesel power plant serving my needs. I could theoretically store my energy by back-feeding into the grid and I could send that energy to you by having my power plant tell your power plant to allocate some of my energy to you. This would require a sort of clearing house which might take the form of a world-wide smart grid where taxes and tariffs could be automatically deducted in transit across national or state boundaries.