As a test two weeks ago, I decided to determine my no fly voltage on an A123. I have a 30% Yak 54 using a single A123 2300 mah pack (2 cells). First I connected the battery to a digital volt meter with a 300 ma load (resistor). With the voltmeter connected to a computer, I looked for the sharp drop in voltage indicating the battery was fully discharged. I then put 200 ma back into the battery, and put it back into my plane. 200 ma is my typical discharge for a full flight.

I have the Aurora 9, so I get a readback from the reciever on the transmitter. The battery was reading 6.2 volts on the transmitter while cycling the control surfaces. I kept it on, and let it drain down. Once the voltage hit 6.1 volts, it started dropping, but not so quickly as to be undetected. Bottom line, as long as I am reading at least 6.2 volts on the transmitter, I'm still good to fly.

On my plane, these cells are typically good for about 10 flights before I recharge.

Brad