It's all about the tech. Not disposable cells on the "one to a dozen" scale, but rechargeables by the cubic meter: wanna drive a car 300 miles? Tesla batteries.

It's all about the tech. Not disposable cells on the "one to a dozen" scale, but rechargeables by the cubic meter: wanna drive a car 300 miles? Tesla batteries. Wanna buffer your house power, daytime power demand at nighttime costs, or nighttime power use from solar? Tesla batteries. Anything you'd put gasoline in for high-power untethered use? Tesla batteries. Remember: the first Tesla car was powered by an enormous number of laptop batteries (basically AAs by the hundreds/thousands). Current battery technology insufficient (your phone only lasts a day on a charge, or your electric car only gets 100 miles)? now that he's getting demand up for big-money big-volume batteries, Musk can fund battery research and production on a scale way beyond anything we've seen. Remember: Musk's "gigafactory" project is intended to build more batteries than the entire world currently produces.