AAA Battery Power Shield for Arduino
Give your Arduino project independence from wall and USB power with ths AAA Battery Power Shield for Arduino from PMD Way.
This nifty power shield contains a boost circuit that takes the power from two AAA cells and increases it up to a neat 5V, with a current maximum of 350 mAh.
A power switch is fitted so you can turn the battery power on and off, and the USB socket allows you to power external low-current USB devices if necessary.
- Download shield schematic (.pdf)