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BQ24261M: BQ24261M is not connected to battery

Part Number: BQ24261M

Design with BQ24261M,  when there is a battery, the system can work normally, but when there is no battery, BQ24261M VBAT voltage is 0V,  VSYS and VBAT is not turned on, 

In this case, the system is powered by USB, and the system is unable to work.

How to solve this problem?