Anything really mass-market anyway.
Yes friends it's true, the Risutobandobatteri *straight from Japan BTW* has you covered. Charge your PSP, DS, iPod and more, any time you need - on the go!
Why this little wonder sits comfortably (maybe) right on your wrist! When you need to get a 'charge out of life' simply plug your drained gadget right into one of it's many ports and...
Well to be honest, I have no idea if that's how it works. I can't read Japanese. But it looks cool. And I thought I'd share.
Read the story on Engadget (where I sees it)
Read the original site (good luck)
*Remember - If it is completely discharged, it may not be available until some charge