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BQ27320:the capacity of battery display error

our product use bq27320 fuelgauge to manage battery,but after having some monkey tests,the capacity sometimes was 1% ,Actually battery voltage was 4.25v.we test fuelgauge Vcc  pin and bat pin,the result was ok. If the battery was removed and  inserted again,the capacity was ok,   our had 100pcs samples and 4 samples occure this error.do you have some sugestions?


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