You will need the fuel-cell (Minipak) to generate the power and the hydrogen generator (Hydrofill) to re-fill the fuel. The Minipak is a USB charger/power generator and the Hydrofill is used to charge the tanks (Hydrostiks, included with the Minipak). You could also use bottled industrial hydrogen in place of the Hydrofill hydrogen generator.
You can find more information at http://www.horizonfuelcell.com/portable_power_minipak.htm.