I just received one of these through the post: http://pi.gate.ac.uk/pages/mopi.html http://pi.gate.ac.uk/pages/mopi.html Lets you use a battery pack with a ha

I just received one of these through the post: http://pi.gate.ac.uk/pages/mopi.html http://pi.gate.ac.uk/pages/mopi.html Lets you use a battery pack with a handful of AA batteries as a UPS. You can even detect when one power source disappears and then safely shutdown. Amongst various other useful power related things.