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BQ25731: Battery gets charged even if the charge current is zero

Part Number: BQ25731
Other Parts Discussed in Thread: BQ4050

Hi techies,

I am using a bq25731 charger with a fuel gauge bq4050. Now when I insert a 20v charger , and make my charging current 0 by writing to the charge register 0x02, even then my battery charges from 10% to 100%.

can anyone let me know what causes the charging of the battery.