The Horizon MiniPak Handheld Portable Fuel Cell Power Charger uses hydrogen fuel cell technology to keep your portable electronics powered up. Their fuel cells combine oxygen with hydrogen from the Hydrostik, and converts it to usable electricity. Now you can stay powered up, and off the grid for months. Just make sure you have a good supply of Hydrosticks ($12) available. Each Hydrostick is good for 10 hours of energy and can be refilled up to 100 times. Equivalent to 1,000 AA batteries.