Not sure if this has been discussed already, but the idea just occurred to me that Apple should either license from, or flat out partner with, Seiko to use their Kinetic technology. Hell, Apple could just flat out buy Seiko. For those who are unfamiliar, Seiko Kinetic watches are quartz based. However, instead of using a normal watch battery they convert the mechanical movement of the watch while on the wrist into electrical energy. The energy is stored in a battery, so the watch continues to function once taken off. I believe it's enough to keep the watch going even while sitting in a drawer for a few months. I would think Apple would be able to find a way to use this technology to extend the battery life of the Apple Watch. I doubt it would be several months given the power demands, but if it was enough to add even just half a day I think that would be a big win.