The Arduino AA Undershield

I recently bought an Arduino Diecimila board. It's awesome and the applications, you can use it for or with is almost unlimited. However there's a problem when you want to use it in portable applications. You can use the Liquidware lithium backpack, which is a good way to power the Arduino. There's a problem with the backpack though, cause when the battery dies, you'll have to find an USB port or another ex ...

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