I went to flight test my hexacopter for the first time and had several power issues. They may or may not be related so I have included both issues in one post.
Issue 1 - Uneven throttle response across motors.
I armed the hexacopter in manual mode (without props) and throttled up. The motors started spinning at different times and while they were spinning some of them would stop. On throttle down some would stop before others. This was not a little gap between the first stopping and the last, they were definitely not ‘in-sync’.
I did a motor test in the actuator tab, and when I control the motors from QGroundControl, they spin up and down together perfectly.
Issue 2 - battery failsafe activating on full battery
The battery failsafe activated several times, either saying low or critical level had been reached, or the battery had been disconnected despite their being a full battery, and the status bar icon showing a full battery. See attached pic.
My setup is:
Flight controller : Pixhawk 6C mini
Autopilot : PX4 (latest one that QGroundControl added)
Power module : Holybro PM08
Receiver : Radiomaster R86
Transmitter module : FrSky ACCST
Battery failsafe parameters:
Low : 20% - RTL
Critical : 10% - Land
Any advice on how to proceed would be very helpful. Thank you.