ORIGINAL: Harley Condra
When the ECU battery is plugged in, regardless of the receiver switch position or whether or not the transmitter is on, the ECU will continuously drain the battery, eventually discharging it.
The JetCat manual is very specific about this, suggesting unplugging the battery at the end of each flying session, if you use Lithium batteries to prevent overdischarging. They do not recommend using lithium ion cells. (high impedance)
If the battery had been drained sufficiently, the reason for the powerfail warning is obvious.
I suggest you completely charge your LiPo batttery and give it a go at full charge after conducting a full check and completing the repairs.
Another sugestion for you is to NEVER blow a fire extinguisher up the tailpipe...always discharge it down the inlet, even if the bypass cover is insalled.
Reason: You don't need any burning fuel in your (or anyone elses) face!
Hi Harley
I do disconnect the battery from the ECU before putting my jets to bed for exactly the reasons you mention. The battery was fully charged before the incident, and still shows 89% capacity so no problems there. The shutdown was not normal, and although I had selected a shutdown the starter motor was still engaged and spinning the turbine. Glad I had the manual fuel cutoff valve to stop fuel flow to the motor. In the heat of the moment (pardon the pun) I can't remember the exact order of events, but I did disconnect the battery from the ECU once I'd put the fire out - this may have caused the powerfail indication.
Cheers for the advice about fire extinguishers - I must admit I gave a squirt up the tail pipe just to ensure the flames were fully out. Fortunately they were, and there was no one else around the model to worry about. I'll bear your comments in mind for the future though.