Kuntuckian

Hello, I have a new 50CC size Biplane with 7 ea. HS-5645 servos and a smaller one on throttle. I am planning on using a 6Volt 2650MAH Nickle Metal Hydryde battery to power the receiver. Since I have no experience with power draw of these servos in typical use, I am wondering if this is enough battery to fly a couple of times at the field. Or do I have to bite the bullet and go with bigger Lipo capacity? Please help with actual experience in similar service.