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ba20z655-r1电量突变的问题请教

用BQ20z655-r1做了一款4S锂电池,现在测试发现一个问题:电池充电时,从93%突变为100%,FC置1,显示为充满电了.但是如果拔除充电器,一进入放电状态,电量就会从100%突降至93%(也就是回到当初突变的那个值).不知道这是什么原因?