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BQ24170工作不正常

使用24170给两节串联的18650充电,ntc处焊接10K电阻代替,如果安装电池后,再接入9V电源,状态灯闪烁。在未接入电池的情况下插入9V电源,状态灯常亮,然后安装电池,状态灯还是常亮,但是电流很小,50mA左右,请问什么原因会造成这个现象?