It's always amazing to see how far concept ideas will stretch the limits of technology, which is why this AA USB battery will blow your mind.
The AA USB battery is exactly how it sounds -- a hybrid of an AA battery and a USB memory stick. Twist the top and it'll become a flash drive. Need a power source instead? Twist it again and you've got yourself a working battery. With USBs getting more and more advanced, the AA USB battery takes the win for innovation right now.