I read something recently - an article from a couple years ago.
here's something more recent
New Structure Allows Lithium Ion Batteries to Get a Quicker Charge: Scientific American
I think they apply a glass coating to the nano-tubes the ions travel along, which makes it easier for them to jump off and get back
heard something about 26650's recharging in 5 minutes
EDIT: the story Ive linked isn't the one i read before, it's a different tech, and I see several others just getting started, so i've no idea what they've done in that particular radio controlled application, let us know if you see something else about it - I don't think anything new is out, yet