The only thing that is going down in price that I know of is High Capacity Batteries. The High Capacity Batteries we use today are made with Lithium and Cobolt. Lithium is a semi rare metal that floats on water and burns when it touches water. Most of the Lithium in the world is dissolved in the Ocean water. I think that Lithium isn't synthesized by the fusion in stars, instead it is created by powerful radiation hitting other elements when stars explode, I think that is why it is so rare. I think they use electrolysis on sea brime to extract it.
When we recycle old batteries, we are increasing the Lithium supplies and bringing down the cost of producing it. The faster we make high capacity batteries the cheaper they become and eventually electric Cars will be cheaper than fuel Cars. At the moment they are a lot more expensive.
