Simple Battery Converter From Brando
It never fails, you need a flashlight and the batteries are dead. Of course, it takes D batteries and you only have AA's around to keep your mouse powered. What if your AA batteries could power that flashlight?
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The people over at Brando obviously ran into that issue on more than one occasion. They have created a simple device that turns your standard AA battery into a D. Bear in mind that it won't last as long a regular D, but it will get you through in a pinch.
Now all you have to do is remember to actually put those batteries back in the charger when you're done.
K.I.S.S. applied to Battery Converter [via ubergizmo]