Take a look at this:
http://www.electronista.com/articles...owire.battery/

OK, it's just a laboratory development and needs to work it's way through
all the R&D to become an actual product. But, an order of magnetude
improvement? WOW!

Of course, as many 'negative experts' will point out, if this thing shorts
out, your airplane goes supernova.

However, if this thing works out, a 10 hour, 1000NM range electric airplane
is actually possible.

Bill Daniels