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Usually, we need a charger for charging the rechargeable battery. There are also chargers for charging with solar energy. However, we didn't expect to charge the battery without these extra devices.
Here is a self-charging solar cell, a transparent shell inside a solar panel, so every time the battery is exhausted as long as it is placed in the sun can be charged. And it can also be used to charge other devices through the 3.5mm interface cable, but I think how much energy can be stored by such a small amount of electricity. I haven’t even fed myself enough to feed others. This is how selfless it is. 2011 IF Design Contest concept group submission work. Designers: Yung-Hsaing Chang, Ming-Shien Lin & Chang-Ting Lu
Woodwin Door & Window Industries Co., Ltd , http://www.chalwindow.com