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BQ24725AEVM-710: stop charging at constant current phase

Part Number: BQ24725AEVM-710
Other Parts Discussed in Thread: BQ24725A

Hi,

my customer is using this EVM to charge 2 cell battery with 9V input.

First time they set full voltage=8.2V, fast charge current =1A, the charge will suspend when battery voltage=7.83V.

Second time they set full voltage=8V, fast charge current =1A, the charge will suspend when battery voltage= 7.78V.

What may cause the problem and how should we check?