RE: Capacity of the receiver battery?
Yea you'll be fine with that pack.
I used to fly my Avistar (5 servos) on a 1000Mah Nicd pack and would recharge every 4 flights or so. Now I use a 1500Mah 2S lipo thru a regulator and still recharge after 4 flights just as regular maintenance but the increased voltage is sure nice!