Navio+ advertised battery monitor shows 0V

In mission planner I have tried to set the battery monitor to use
Voltage and Current
3DR power module
APM 2.5+ volts…

Is this wrong or something? The on screen battery voltage just shows as 0V and 0A…

You should set it to:

Voltage and Current
Other
Pixhawk

Then follow the calibrating procedure:

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Cheers!