Some kind soul, who's handle I forget at the moment, +T him,
gave me this link when I was looking for a battery to plug into a DC input
instead of using internal batteries or an outlet.
I've only used it a handful of times so far, but I'd have to say this thing is the cat's meow, so to speak.
http://www.batterybarn.com/pr2310.htmit has settings for various voltage and interchangeable tips to match your device.
This thing will even power my old Tascam Porta07 at 12V DC!
and has the crucial, but hard to find (in Japan, at least) 5V setting as well.
The only thing it lacks is USB compatibility... but for us Luddites, that's no problem.
lol
What's more, they even shipped it to me in Japan!!!!!
Now
that's service!