Too bad this is not up to the size off grid living, or on grid storage, needs... but there is potential.
A lighter(?) and cheaper technology... just needs to get out of the lab...
Stanford's aluminum battery fully charges in just one minute
http://news.stanford.edu/news/2015/march/aluminum-ion-battery-033115.html
http://www.engadget.com/2015/04/06/stanfords-battery-charges-in-one-minute/
ADD: mind you the TESLA solution, a lot of AA batteries, could be used if it comes out in AA format...