Toyman94,

Mine flies great with the battery under the wing, but I never tried the stock location. Also, I never checked the CG with my GP CG Machine - oops. I went on Brian's recommendation (@ Ultra-RC). I probably have 50 flights (batteries) on mine - lots of airtime. I get 15 - 17 minutes (3D flying) with the Ultra-RC 1500mah 3 cell lipo and 12 - 14 mins. on their 900 mah. I can stretch the time 3 or 4 mins longer if I continue to slow fly when I notice the power reduction, but better to be safe. I use the 900mah (and about 20 degrees of flap with elevator mix) for indoor flying. (I fly in a Sports Dome - 3 indoor soccer fields every Friday). I found the lipos last longer (outside in the cold here in Connecticut) if you put the on-board lipo in a small plastic bag to eliminate airflow through it. I changed to a Todd's gearbox (stock gear ratio) and an APC 10 x 4.7 prop - much more precise and smoother than stock, cause I like precision. Also, I cut the stock gear length in half and use MPI Max 2 inch wheels - very durable and light and good looking. Taxi's well on Astroturf, good for touch & goes, plus the gear protects the battery from a bad landing. The gear can be easily bent back in shape while installed. Good Luck, you'll enjoy. I don't like to fly mine in wind greater than 5 mph - gets to be a real handful for me. It flies so well I bought the 3D Buddy Edge 540 also and it flies the same way. My only complaint is structure twisting. You have to be careful how you transport and store the plane so not to induce any twisting, especially with large ambient temperature changes. I used to heat the film and twist the opposite way, but now I just fly it and trim it out.