Who needs fuel cells? No really! Strategy Analytics predicts that the market for battery cells will exceed US$9 billion by 2010 driven by the growing demand for portable devices, however, the demand for small form factor fuel cells will be disappointing. More efficient power usage will reduce the overall power demands of portable devices while, new cell chemistries, such as lithium-sulfur, will double the usable power, says analyst. Lithium-sulfur batteries promise to double the capacity of traditional rechargeable batteries while the development of the fuel cell market will be inhibited by the lack of a suitable supply chain and restrictions on the carriage of methanol on public aircraft.