Problem whit Multiwii pro and turnigy 9x

Hello everyone

I'm building my first quadcopter
Frame 700 mm
Motor sunnysky
ESC SimonK
FC MultiWii pro w gps
Tx Turnigy 9x

I loaded the program using arduino on flight controller MultiWii defining the correct values (looking at several guides on the web).
I

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11.1 or 14.8v ?

I am looking for a battery... watching on forums, hobbyking and using Ecalc...
Some one say 11.1 v battery are better than 14.8 v ...I prefer 14.8 v
My goal would be to transport my camera (300 g ) with a reasonable flight time 10-15 min using 80% ru

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