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bq24090 PG引脚相关问题

如上图:

请问:像充电芯片的这个指示灯是在什么场景下需要用的,第5引脚是在输入电压大于OUT电压时为低,也就是说用来指示充电适配器是否插上?

此外,第九引脚连接一个可变电阻(热敏电阻),这个是需要电池内部支持,还是要单独购买热敏电阻贴在电池外面,还是可以不用?不用回有什么影响?

谢谢~