ESC Li-po Voltage cuttoff

[irjamesm]

I replaced my ni-mh esc for one that would take li-po's.things i read say not to let the li-po go below 3.2 -3.0 volts per cell, i have a 3s pack so thats no less than 9 volts.
the esc i got says the voltage cuttoff is 2.75 per cell so thats 8.25.
When i would fly my ni-mh i would just run them till they died and glide to land, with maybe another 10 sec. if my firsy landing attempt didnt look to good. So are you not suppose to run it down to the point of cuttoff?

[CalmAir]

You do not want to take Li-Po or Li-On down past 2.75 volts per cell as irreversable damage can occur to the battery cells. You did the right thing by purchasing the ESC for Li-Pos. Your ESC will cut off the power if it goes beyond the limit, which is different than what you have been used to, however you can tell when the Li-Po starts to lose voltage and can bring the plane on in at that time before you reach the cut-off level.

Dale

[irjamesm]

Or i was thinking that the 8.25 cutoff is total cutoff, to servos and everything. and motor cutoff would be at the 9 - 9.6 volt range?
cause if they are making esc for a li-po battery they know that it should'nt go below that voltage.

[aeajr]

Don't confuse resting voltage with voltage under load.

Your LVC will cut when the voltage under load hits 2.75V. But when you check the batteries after you land, the will probably be over 3.0V at rest. It is the resting voltage that is the critical number.

You can run your lipos to the LVC cut off. But after you do you will find that you can restart the motor for a short time. If you only use part throttle you might even get another minute out of it. That is a bad practice.

When the LVC comes on, come in for a landing. If you must, use that part throttle run time for a little help as you land, but that's it. Don't keep restarting the motor to keep flying or you will likely do some damage over time.

Understanding the BEC/LVC Features of your ESC
http://www.rchangout.com/forums/showthread.php?t=15806