The editors of our sister publication, Remodeling, discovered a very interesting battery that's being produced today. With all of the renewable resources being explored, not much energy (sorry, no pun intended) is being spent on storing what that resource produces. Touted as the "first Cradle-to-Cradle batteries," these certainly offer some great solutions for existing renewable technologies. What we're excited to watch is how tool and car battery technology will evolve along these lines.
Here's a video on how these batteries are made.