Is There an Explanation for Current Readings on HDX whilst its Powered by Backup Battery Only?

[Bardample]

I have just replaced a faulty Dynon EGT probe ( (515 hours since new) on cylinder #1 . I had removed the Earthx ETX 680 battery , as this was faulty as well ( not holding charge after flight, or on the bench after charge out of RV).

When I powered the Dynon HDX with the Dynon backup battery alone, to check that my newly installed EGT probe functioned ( it did) ,I noticed the Ammeter reading was 8Amps and the 'measured output ' from my Monkworkz input was 2.6 Amp. Obvoiusly, the only power supply in the plane at the time was the Dynon supplied back up battery.

Can anyone explain this to me? See the screen shot of part of my monitor at time.

 

[BlueCrab]

From my perspective, explaining this without a schematic, is impossible. I would need to understand how your system is measuring those inputs and any conversions/scaling the Dynon HDX is providing.