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BQ24250: BQ24250 can't working normal?

Part Number: BQ24250

Dears,

When only use the Battery connect to the system, the BQ24250 can't working sometimes,I use multimeter to test the SYS and LDO pin's voltage, it's 0V; And If I plug the adapter to the Vin pin ,the BQ24250 can working normal, at this moment that I remove the adapter and the BQ24250 can recover work, I don't konw what's can cause the BQ4250 can occur the problem untime? It's like go into sysoff mode, but I don't to operation the  register use code. Could you kindly give me some suggestion to solve the problem? Thanks a lot.

Best regards,

Jacking