No there is no unit that I know of, which does not mean it may not exist.
To power a unit such as a RME UCX which is a portable unit (or can be used as one) you need a power supply, the rest can be handled for the audio channels over USB (to say a computer or something).
 

Car Cable

(AUTOK)

for MADIface XT, Fireface UCX, Fireface UC, QuadMic, Babyface, ADI-2, ADI-4DD. Power supply (used for telescopes like a car battery).
Orion Dynamo Pro 17Ah Rechargeable 12V DC Power Station
http://www.telescope.com/Accessories/Power-Supplies-Cables/pc/3/396.uts

http://www.skiesunlimited.com/Celestron-17-Ah-Power-Tank.html
but I do not know if it supplies enough power for a RME UCX, or any such device, but I suppose it does.
 
Then you can go out with a red flashlight or white LED light in the middle of the night and record nature sounds (probably though with only two microphones) or use the unit the way you want to with a battery powered laptop computer. (a little humor!)
 
RME UCX has 6 analog outputs (besides others for a total of 18 I think if I remember).
And you would need a computer probably for the audio channels like a laptop computer running on battery.
Anything else I do not know and I am not sure I know about this either.
 
This post comes with a warning label. Proceed at your own risk.
 
 
 

I appreciate all you guys' effort!
 
I'm just trying to use as few wires as possible! Also, the when the source of audio is completely battery powered, you don't have any ground loop issues so you can get away with not using a D.I.! Just try plugging in the audio output from a laptop into a P.A. on a different ground circuit when the computer is plugged into the power, and then without.....
 
I have an M-Audio Fasttrack Pro which has 4 analog outs and 2 mic pres. That can be powered over USB, so nobody is going to tell me it's impossible to make a unit WITHOUT mic pres but 6 analog outs instead that can operate in a 6W power envelope.
 
Again, the goal is simplicity of setup. I'm running Ableton Live on a beautiful Dell XPS18, which can run on batteries for 5 hours or so.
 
Thanks!
R

Another run on batteries with USB 2 audio/interface.
I doubt if it runs very long on 8 AA batteries. Four ways to power it.
I have no idea what that involves.
http://www.sweetwater.com/store/detail/R88Rec
 
Roland Unit - 8 like XLRs analog outs.
 
And then I suppose that means separate 8 outputs looks like, not perhaps like other units may be only 2 outs - L & R only but 4 connections.
 
I recommend nothing without looking at the Roland site and examining the unit.
Allthough that unit is marked 3 through 8 out where the other two are, I do not know.
 
I see nothing else that has that many outputs that is a portable unit like the RME UCX or now that Roland unit.
and they all cost a bunch!
 
No devices for power that only run on USB 2 or USB 3 or Firewire only for the audio in and out, which the RME UCX unit runs on I suppose with an external battery or like the Roland Unit with its 4 ways to power the unit.
 
 

spacealf
Another run on batteries with USB 2 audio/interface.
I doubt if it runs very long on 8 AA batteries. Four ways to power it.
I have no idea what that involves.
http://www.sweetwater.com/store/detail/R88Rec
 
Roland Unit - 8 like XLRs out.
 
I recommend nothing without looking at the Roland site and examining the unit.
Allthough that unit is marked 3 through 8 out where the other two are, I do not know.
 
I see nothing else that has that many outputs that is a portable unit like the RME UCX or now that Roland unit.
and they all cost a bunch!
 

That's it! You found one!
 
As a matter of fact, this thing is the PERFECT backup for an 8-track Ableton track playing machine..... I'm gonna see if I can get my boss to buy one!
 
Glad to know this forum still rocks!
R