I was originally planning on using a laptop battery to provide portable power for my box.

I recently ordered an Adafruit Powerboost 500C for a different project, and when it arrived today, it got me thinking...

It's ideal for providing 5v from a 3-5v power source, and has an inbuilt charging circuit for Lipo/Li-ion batteries.

I have 4 5000mAh, 3.7v Ultrafire batteries lying around from a Wall-e Project that didn't get completed; these bad lads have protection circuitry built in so it should be safe to use the Powerboost with these running in parallel.

If this works I plan using to power a 10 port USB hub from it, and I will use this hub to connect the Pi (for power and data) and my other peripherals (Arduino/Teensy, Wifi dongle 2.5" Hard drive.

The plan is coming together!