ORIGINAL: Rodney
If you stopped at a voltage of 4.6 volts, you still had over half the battery capacity left in the battery. You could probably have safely gotten another 50 minutes of flight time.
It was my understanding that on a 4.8 volt battery, you shouldn't go under that number. What IS a safe voltage to still fly? The only way to really find the definitive number would be to exceed it and I'd rather not do that!