RE: 6 Servos on a 4.8 volt, 700mAh Sport Battery???
What is the question. I am putting togehter a 6 servo sailplane and would have no concern with 6 servos on a 700 mah nicad pack.
Remember that you are not drawing much from a quiet servo. So you will be working ailerons, rudder and elevator a lot, but flaps are not likely to be working much unless you have them coordinated with the ailerons. The retracts is down then up then to sleep.
You should easily have enough current.
What kind of flying are you doing? Sport cruising around the field, or full pattern flying?
More info please.