I'm currently setting up the Ardupilot on a Skywalker, and as always I will use a separate battery for camera/OSD/VTx. I am flying with a 4S LiPo and am trying to avoid step down converters and filters.
Are there any plans to add monitoring of a second battery to the APM code? I have seen people mention that it will be implemented, but those posts are over 6 months old. I have also looked at the MinimOSD Extra source code and there are lines with "osd_vbat_B" commented out.
It shouldn't be that hard to implement, but if someone else has already started coding it it would be nice to know.
The obvious way to connect a second battery is through a voltage divider to a free analog input port on the APM.