Lipos are the same but I think they say stop flying at 6.4
ORIGINAL: jetflyr
ORIGINAL: KC36330
ORIGINAL: Dr Honda
Regardless, I think you are safe for 4 or 5 flights between charges.
i fly till the voltage drops below 6.6, typically 5 flights, i have got 6 but it's not often.
If in deed you fly until it drops below 6.6 you are looking for a smoking hole! The discharge curve on LiFe chemistry gives basically a 90-degree elbow drop off.
DO NOT let it get below 6.6, the airplane you save will be your own!
Greg