This mobile USB charger uses a fuel-cell cartridge. Inside the cartridge is a coiled flexible foil strip, about as thick as a Band-Aid, that contains the exchange membrane and fuel. The cell is activated when the user fills a small built-in tank with water. Unlike other fuel cells, it requires no pumps, increasing efficiency and reducing weight.

Product: PowerTrekk
Cost: About $200
Availability: Fall 2011
Source: www.powertrekk.com
Companies: myFC