A hydrogen source comprises a first hydrogen reservoir for containing hydrogen in a first form and a second hydrogen reservoir for containing hydrogen in a second form different from the first form. The hydrogen source comprises a means for converting hydrogen from the first form to hydrogen gas and transferring the hydrogen gas from the first hydrogen reservoir to the second hydrogen reservoir. An interface is provided for transferring hydrogen from the second hydrogen reservoir to a hydrogen reservoir in a portable device. The interface comprises a fluidic coupling. The hydrogen source may be used to provide hydrogen fuel to a wide range of portable devices.