STM32F407 RTC

I use the RTC of STM32F407 with LSE (32.768 kHz).

A battery is connected to VBAT for backup.

In the reference manual, the Backup operating voltage is at least 1.65V, but the RTC is actually backed up to about 0.3V.

I do not know the reason. Could you tell me why?

Thank you.

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