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Yoyo Charger is not only a yo-yo, but also a battery charger. When children are playing yo-yo, the battery is charged through the way of mechanical energy converted into electrical energy. Full charged battery can be used for electric toys.
By the way of entertaining, let children develop energy saving and environmental protection consciousness.
Ningbo institute of technology, zhejiang university
Ye Zhou,Aodi Huang,Shiqiao Wu,Jingjing Feng