I'm talking about the voltage the Vbat sense pin "sees" - it goes into a voltage divider for voltage monitoring. Yes the backup battery powers things but at that point it is what it is in the Nano board design. If the battery supply system is designed badly it stands alone as a bad design. But at the Vbat SENSE pin it (IMHO) isn't an issue because of the voltage divider. The diode issue is only for the Vbat sense - for the ADC circuit, as we all know if the diode is missing the backup voltages still are working. This is ONLY for the Vbat input pin for sensing. And as I've noted both my units have been operating for weeks with the schottky diode and they aren't a pile of ashes. :-)
