Presently engineers are working on battery tech that will allow much faster charging without degrading the cells overmuch over time, denser and more long-lasting storage, and faster discharges. The technology involved in supercapacitors and ultracapacitors are seen to be the key to these processes... we may expect to see the next generation of batteries include SCs or UCs in their systems to facilitate this. Or, the SCs and UCs will be made fairly modular and added to battery systems as required.
BUT!...
Maybe we're all worrying about battery-powered cars for nothing, if
Popular Science has it right!