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请问BQ500211A发射,他是怎么知道充电完成了呢,进而切换指示灯的颜色,除了接收线圈告诉他,他自己有什么途径知道吗

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请问BQ500211A发射,他是怎么知道充电完成了呢,进而切换指示灯的颜色,除了接收线圈告诉他,他自己有什么途径知道吗