Do I need motor for portable power on arduino

i have the wave shield and UNO Arduino connected for the software downloads and when time to use I need to know what would be a good portable power source?

A battery pack with six AA cells in series (9V) can be connected to the power jack to power the Arduino and shield.

If you don't need the analog inputs to have a regulated 5V reference you can use three AA cells in series (about 4.5V) to power the Arduino through the 5V line (or via a USB cable with just Red (+) and Black (-) connected).