You may want to check this out concerning the battery https://forum.allaboutcircuits.com/threads/real-time-clock-rtc-breakout-boards-warning.118173/
Posts made by cncman
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RE: DS3231 RTC Module Pin out and operation confusion
You may want to check this out concerning the battery https://forum.allaboutcircuits.com/threads/real-time-clock-rtc-breakout-boards-warning.118173/