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Can not read out the register content of BQ24725A by bq2473x Evaluation Software v1.1.2 while in battery discharge mode

as the title, i am using the bq24725AEVM and BQ2473X Evaluation Software doing the test,

if i connect power source to the (Adapter+, Adapter-) and (Pack+, Pack-), i can write and read all registers normally, but if disconnect the  power from (Adapter+, Adapter-), only keep the  (Pack+, Pack-),  i can't do the read function normally anymore and the Evaluation Software show a error message,  why it can't be read out  under the battery mode?