Absence of a power source that can supply power with many hours between charges is now the single biggest obstacle to the dream of ubiquitous computing and smart phones. Nokia has actually cancelled a smartphone product because its numerous features ran down the battery too fast. Meanwhile, Japan's mobile phone makers will add power-hungry digital broadcast tuners to their mobile phone models. Fuel cells are seen as a way to meet increasing demands.

(by Toshiba)

Toshiba, KDDI and Hitachi has jointly developed phone that use fuel cell battery to power on. A small fuel tank has made and put at the back of the phone. The high density methanol is able to give 2.5 times longer talk time than current technology. The the fuel run out, just refill it from a fuel cartridge and you can use it continuously.