I am brand new to Arduino and my first goal is to incorporate a battery back-up into the Arduino that is automatically utilized when the Arduino is unplugged, but is rechargeable when the board is plugged back in.
Here are my thoughts:
Can I use a sparkfun powercell: http://www.sparkfun.com/products/10300
with a li-po battery and connect the 5V output from this board to the Vin of the Arduino?
I know the powercell can provide 5V out and charge at the same time. So instead of powering the Arduino from it's own USB or barrel-jack, I would plug this powercell board into the wall and power the arduino from it. If the USB from the powercell is unplugged, the Arduino would be powered by the battery.
I have NO circuit design experience (yet) so I'm trying to do this as simply as possible.