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BQ40Z50 FCC跳变问题

电池放空后充电,当电池充满的时候,FC置1,FCC由之前的21AH突然变成5AH了。

充满后FCC的值变化了好几次,但是都与实际值差太远了。充电过程有上锁,没有任何dataflash的改写动作。

附件是LOG的数据,请各位专家帮忙分析下原因。