U disk, rechargeable battery seems to be unmatched, but if these two small things in daily life are indispensable, is not it a lot easier? The conceptual design proposed by Wonchul Hwang (should be a Chinese surnamed Huang) is very creative. When it is plugged into a computer, it can be used as an ordinary U disk, but also for the internal battery module. If you run out of battery power on a digital camera, camcorder, flashlight, radio, etc., twist it and turn it into a fifth AA battery. There are three LED power indicators on the side. Maybe we can call it "AA USB."
If someone can convert it into an actual product, I believe it will be welcomed by many digital users. Of course, there are still many problems to be solved, especially the combination of the internal structure of the battery and U disk.
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