Hitec HS-645 MG has higher torque with no warning labels about what kind of batteries you should use or where you can use them. AND...for this it's few dollars ($5, I think) more...but use whatever batteries you want. This is generally a good servo I've used for years for 15 to 25 lb. scale planes. For a 9-10 lb. aerobatic plane it should be perfect. Currently using them in my H9 Funtana 90 flawlessly.
