As humanity goes wireless, the last pesky tether we and our gadgets have to escape is the power cable. Portable, battery-powered chargers tend to be both inefficient--so low-powered they struggle to recharge modern smartphones--and environmentally unfriendly. There have been off-the-grid chargers that rely on renewable energy before, valiantly attempting to rectify those problems, but most are ineffective without a steady source of wind, solar power, or abhorrent manual labor like cranking, yanking, or shaking (ech).
Enter the next generation of outlet-free power: Micro hyrdrogen fuel cells like Horizon’s MiniPak. The MiniPak claims to bring the ten times the power of traditional batteries while releasing waste in the form of harmless water vapor. But is it practical?