We've been promised portable fuel cells for ages, now. Ages! Finally one is only months away from release -- but its performance seems so limited we're not sure we care anymore. It's the Aquafairy AF-M3000 and, despite its name, it's powered not by water but by ethanol fuel packs. Here's where the bad news comes in: a single fuel pack only provides enough current to get an iPhone up to a 50 percent charge, and it'll take 90 minutes at that. So, you'll need two cartridges and three hours of your time just to bring a dead mobile bac
