I have a Jeti Advanced 30 plus , does anyone know if i have got this right

Does the BEC have a cut off point ( voltage ) or am I right in saying that the ESC will cut the motor when it gets to 9volts ( if set for a 3 cell lipo ) leaving the remanding pack voltage for the BEC, but at what point would the BEC stop powering the servos and receiver ?

The reason is that my 1700mah pack ran down quickly ( recharge took 1650mah ) on a landing approach and at 3 feet from the ground , seamed to lose all power/ control so the motor may have been cut due to getting close to the 9 volt cut off point , but what about the BEC for the servos and receiver ?

[8D]The bec only youses the remaining voltage in the pack, until its dead. You might want to
check the pack voltage when you land, and see if it's really shuting down at 9 volts!
Idon't think so, not with just 50 ma left!

If everything is working normal, you should be able to use the biggest part of your batteries. I have put a bit over 2,000 mAh back into a 2100 mAh and the voltage checked out fine. It was still well into the safe range. I think it is better to not use that much, especially if you are depending on it for your servos and Rx to get you home. Just be sure to watch for your motor suddenly slowing down. When that happens, you should immediately land the plane. The idea is to give you a little reserve, not to allow you to continue flying for fun. There are usually two settings for the cutoff. One is to just slow down, the other does a sudden motor cutoff! Not good for a heli! I would use the slow down method and watch for it. There should be instructions for setting it.