Servo Current Draw ?

[Overdriven]

The difference is going to be negliable. You'll have a hard time measuring any difference in run time just because variations in how much throttle you use on each pack will have more of an impact than the servo + rx draw.

To give you a better estimation, my 1100mah 6v rx pack I used on nitro cars would last at least an hour with two servos drawing on it. If you have a multimeter, just hook it up inline on the red or black wire of the servo (or the esc to see the rx+servo draw combined) and you'll see what it'll draw exactly. It's not much and I doubt it would make a difference of more than a minute or two.