Click on the link so you can see the photograph. The hydrogen cylinders look to be a convenient size. Read more:

http://news.xinhuanet.com/english/2007-09/06/content_6673626.htm

BEIJING, Sept. 6 -- A concept bike driven by an environmentally clean hydrogen fuel cell was unveiled at an international fair in Shanghai yesterday, with the local producer promising to extend its patented technologies to more pollution-free products.

Shanghai Pearl Hydrogen Power Source Technology Co showed its fuel-cell bike at the 9th China International Exhibition on Gas Technology, Equipment and Applications which kicked off yesterday at Shanghaimart.

The company officials said the model had just been completed late last month and they had already received some inquiries and trial orders from interested buyers overseas.

"Most of the buyers at present are individuals keen on clean energy applications," said Tian Binglun, the company's general manager.

"The innovative bike also attracted the attention of many visitors to the fair today," Tian said.

A battery tank and a pair of hydrogen gas bottles make up the energy system for the bike, making it different in appearance from other electric bikes widely used in Shanghai.

A bike doesn't need that much energy. Perhaps ebikes will be an application for a fuel cell. I know in heavy on highway trucks etc..currently, It's a technological flop. Even busses, There are some, but the busses are kept on short, flat routes. I think i'll stick to my nihms and nicads :)

Hydrogen and fuel cells are just a different kind of battery. The good part about a hydrogen bike, though is that you refuel in just a few minutes as opposed to the hours it takes an electric bike to charge.