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BQ27Z561-R1: two battery in parallel issue

Part Number: BQ27Z561-R1

Hi Team,

my customer use two battery in parallel in fold screen smartphone, each battery has one BQ27Z561-R1 inside, battery A is 1210mAh, battery B is 2750mAh. The charging current is ~9A. when stop charging, smartphone is at standby mode and consume  a few mA current, battery A charge Battery B with ~140mA current.  25 minutes later, two batteries are balanced which means no charging current, the remain capacity i 81% for battery A, and 76% for battery B. 50 minutes later, the remain capacity is 81% for battery A , 80% for batteryB,  which means battery A remain capacity is same as before,  while battery B remain capacity increase 4%!  could

bq27z561 log.xls