Hello. I'm going to build an X8 octocopter on the A3 autopilot. The power supply will be the LI-Ion - 6S4P cells. I am asking for information on how to set failsafe: Low Battery - 3.5V - 21V Criticall Battery 3.4V - 20.4V. The Li-ION manufacturer allows discharging to a 3V level.