I'm having issues powering my Pixhack board.
Previously, it was working fine via battery (5100mAh 10C 3S) and USB. Now, it seems to only work via USB.
When I connect with battery, nothing happens.
When I connect with USB it boots fine. If I then plug in the battery, QGroundControl gives me fluctuating readings of battery voltage (2.3 - 3.5V) for about 10/20 seconds, before losing connection. The power to all peripherals such as telemetry unit is sustained, until I remove the USB when all power is lost.
Using a multimeter, the battery voltage is 12V, the voltage from the Power Module is 5.3V (both ends of the cables). I have no ESC/servos attached.
Why is there this erroneous battery voltage reading, and why doesn't it power the board?
I have tried reflashing the firmware and resetting all parameters to default.
Edit: I am now getting battery readings on QGroundControl with no battery connected!? This is stable at 2.13V rather than fluctuating.