How often and for how long do you plan to have all servos in extreme draw?
I use a 2000mAh NiMh in my sport planes and never need to charge at the field.
I do believe your battery is up to the task.
However, I would do some testing to find out what you are using per flight.
Do one or two normal flights on a fresh battery.
Then recharge noting how much energy you put back into the battery.
From this you could calculate safe number of flights per charge.
Good Luck,
KW_Counter