External Battery For BeagleBoard (5V - 3Amp)

Has anyone used a 5v battery (external) for BeagleBoard.
Is there a readymade Battery available or do we need to desing our
own power supply.

Thanks,
Anand

Anand,

You will want to use a regulated supply. When attached to my robots, I
power my Beagle and BeagleXM using BEC or Buck voltage regulator.

http://www.pololu.com/catalog/product/2177
http://www.pololu.com/catalog/product/2110

Regards.
- Jim