Charging battery via USB never crossed my mind, though I have seen and used MP3 player being charged after plugging into USB. But AA battery (USB Cell) charging with USB is something new for me. You may also charge them with your normal charger, after putting the cap on. How about this? The world with no battery. The device getting charged from the powerful radio waves, emitting from super powerful transmitter. Seems absurd now. But you never know - some scientists may already be working on this.
The world is indeed full of ideas and these ideas are on an increase with every innovation. Look around us and see if we can conceive anything of our use - or anything that is going to solve a problem to some extent. I bet your life will get transformed that day. Keep exploring.
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