Also to add to ferrarimk13, you asked about when you should stop and recharge the battery.There are two options that I know of:
1: count on this from Foxy witch is pretty true if running stock servos: "I get about 90mins out of my 1400s"
2: Or this onboard warning system:http://www3.towerhobbies.com/cgi-bin...?&I=LXLWF1&P=7


P.S. I use foxy's method of judging time.