& it seems you didn’t read the article if you don’t know what the things does.

First — the image links don’t work.

Second — what is this thing doing? You buy a “puck” that I guess contains the hydrogen — but then what’s the water for? Also, on their own web site, they say you don’t need the puck because this device contains a normal rechargeable battery as well as the fuel cell stuff.

So, what’s the difference between this thing and any other external battery pack?

On their web site, they say their “puck” provides 4 watt-hours of energy. For comparison, an average alkaline AA battery provides at least 2 watt-hours of energy. So the 3 pucks that $12 gets you equals the energy of at least 6 AA batteries. I think I could go out and buy a few more than 6 AAs for $12… and I don’t think an adapter for AAs would cost $300, either.