devices for cell phones, laptops, PDA and other portable devices to provide energy
, and is currently used lithium ion batteries compared to the weight of only about half of the original lithium-ion battery fuel cell can provide about 4 times battery power. But this equipment is still in testing, it is estimated to be large-scale production in 2004 before entering the market. (The battery has not been applied to a player in, if applied, I believe the time can be Dedao Walkman tremendous increase)