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BQ27426 AverageCurrent is NOT accurate

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Hello, 

We use  the charger IC BQ24295RGER and the Fuel guage IC BQ27426 in our project, we set charging current as 1216mA, so we measured the charging current is about 1.2A via the multi-meter, but we read the register[0x10/0x11] of the chip bq24726, it's about 1.5A, It's so big gap.
 
 Could someone help me to check what is the problem? Why the current are so big gap?
 Could someone help me to get an accurate current reading?
Many thanks!
Mike 

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