That's not going to happen anytime soon. Batteries themselves are still too expensive, but what's even more expensive is the development time spent on battery m

That's not going to happen anytime soon. Batteries themselves are still too expensive, but what's even more expensive is the development time spent on battery management systems. The Tesla S has roughly 7000 individual battery cells, not unlike the single cell powering your phone. If a single cell over drains or over charges, it has the potential to cause a fire. That's easy to do with your phone, there's only one cell to monitor. But thousands of cells, bundled together in various packs of serial and parallel connections? There's a lot that can go wrong. That means these systems have to be bulletproof and I think we can all appreciate how expensive that is in terms of software and hardware development time, let alone testing.