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The design of fun battery is a clever one because it can tell you the power it has and offer a special way to distinguish the old from the new.With the reduction of electricity,the man on the surface of the battery will fall down and approach the open mouse on the bottom.When the man fall into the mouse ,that the battery tells user that it is power off.
Jinyi Chen; Jie Lin; Lanxin Zhou; Yonggang Meng