Measuring 16 (H) x 10 (W) x 6 (D) cm (6 x 4 x 2.5 inches), this portable fuel cell from Hitachi Maxell produces an average of 10 watts of power using nothing but water and and alumunium. With 20 gms of alumunium the fuel cell can power a laptop for 4 to 5 hours at a stretch, claims Hitachi.
Hitachi is currently working to improve the power to 100 watts and use alumunium scrap waste instead of regular alumunium.
