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BQ76920电量计量不准?

Other Parts Discussed in Thread: BQ76920

用BQ76920进行电量计量,累计CC的值,一个充放电循环有较大误差。比如一节18650电池从3.3V开始,充电2000mAH,放电回3.3V时的放电电量有的板子是1600mAH,有的板子可能是2400mAH。感觉CC机的电压值里有偏差(Offset)。如何校准?