T-Mobile are offering a fuel-cell portable power pack as an accessory for their cellphone range, one of the first mainstream fuel-cell applications targeted at everyday consumers. The Medis 24/7 Xtreme Portable Power Solution
runs on sealed cartridges of sodium borohydride, and can offer 20 Watt-hours from a single cartridge.
Each cell lasts up to 18 months unused, and is activated merely by squeezing it and slotting it into the charger device. Once activated, the cell should last for up to 3 months, though Medis recommend using it within six weeks.