This is a new problem for me but I am sure the answer lies in the physics of batteries and that one of you can explain it to me.
I have a new X6 build using Pixhawk I have Taranis telemetry working. I have had a few test flights to see how things were going and everything looked to be as it should be.
Then I was ready for the hover test and flight duration test. I have noted on the short flights that the hover current was about 35A which agreed pretty well with eCalc. When I tried the longer duration hover test with a fully charged battery (6 x 4.2v, 25.2v) I had a low voltage warning at just under 8 minutes.
I have attached the log file of voltage and current. It shows the current at 35A (average) .
The voltage started at 25v + and stepped down to 23.8v (6 x 3.99v). It is then pretty linear decay down to 21v (6 x 3.5v). The battery warning is set here and it told me to land. Which I did (then didn't kill the throttle and it fell over and I have a CRASH badge of honor in my graphs).
The final voltages I checked with no load were at 22.9v (3.82, 3.83, 3.82, 3.86, 3.77 ,3.87).
The battery is a Turnigy 12000mAh Graphene 15C.
Lastly, the total current graph shows just under 5000mAh which makes sense (8 mins, 35A, (8x35)/60=4.67). The telemetry was showing about 60% left on battery charge.
The AUW is 6.5KGs, Tarot 5008 - 340KV motors.
1) Does this look right to anyone?
2) Could the Attopilot current measure be out by a a lot and I'm pulling a lot of current? Although eCalc is not far off. Each motor lifting 1.1Kg looks like 7A on the motor curve.
3) Is this battery a piece of crap?