/technologies/power-management/b/alt-energy-blog/posts/new-charger-uses-one-fuel-cell-and-one-battery-to-charge-over-usbMyFC's hydrogen fuel cell and battery pack, " PowerTrekk ", is packaged to be the backup of choice for all those "off the grid." Although it looks delicate, the Powertrekk is "rugged, waterproof, and robust." Wall chargable, you use the devices batteryen-USTelligent Community 12