If you need to run your Arduino of a battery pack, you need to find a way to reduce it's power consumption. One of the the best ways to do this is putting your Arduino to sleep when it is not performing any tasks. This tutorial is a great place to start on learning how to put your Arduino to sleep.

Link to blog:http://www.thearduinomakerman.info/bl...
Link to Facebook Page:  / arduinomakerman