Cool info. If anyone's interested in battery technology, definitely read the multiple articles on Tesla & GM's ventures in Lithium battery research and where that's headed. Just like growing efficiency in solar panels and chip density, things are only gonna get lighter and more efficient Then you will see how amazing electric bikes will become. Just gotta have patience. But it's not a pie-in-the-sky thing, it's here and now and progressing.
Consumer-level Hydrogen fuel cells? Now that might be a little pie-in-the-sky still, heh...