Is there a possibility of CORE BROWNOUT happening with quick battery plug yes and plug in?

Yes, there is miniscule probability of this happening if the 1.8V regulator output (input power to the on-die LDOs, which make 1.2V VDD_CORE) goes below about 1.6V. But the RTC POR is by default set to only give an RTC reset if VRTC falls below 1.4V.  So there is a voltage range where a dip could cause CORE BROWNOUT. Our module is not 100% brownout protected, for all possible voltage dips and durations.  Removing the battery for a few seconds, then replacing it should give a clean RTC reset.

 

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