Using or building extenal battery pack for the Mu

I would like to build or buy an external battery pack for my Mu-Vo. I go on long trips and don't always have access to power. I'm thinking of building a pack that runs off of AA's (rechargeable). The documentation that I've been able to find says the units uses 5V. The battery pack would generate 4.8V. Would this work? Has anyone built such a device? Is there one commercially available?
Thanks
Dennis

http://www.bixnet.com/usbbatterybox.html
If you use 4x2300 or higher NiMH batteries you can get a number of recharges/extended battery life from one charge.
I have a couple of these very handy gizmos, and with the right adapter cord can run a JB3 down to a MuVo?4 / Micro or TravelSounds.
jake

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