Papa- Look closely at the pics in the instruction book . I mounted my rec on its side and the battery on its side opposite of the muffler .and secured them with two rubber bands fastened to four cup hooks fastened to the base of the mount. I then fabricated a cover that went under the side rail of the fues. This cover was split and was bolted together near the middle with two 2-56 cap screws into T-nuts . The battery side of the cover was offset with a 1/4x1/2 spacer because the battery was higher than the receiver. This positively holds the battery and receiver and I found this setup neccesary because after flying awhile I had the battery move on me. This is a belt and suspenders setup but I do not want to lose a plane over something as simple as not securing the battery properly.
When I am in the final stages of breaking in a new plane, I taxi it around using up a full tank of fuel and often lift the plane off the ground 6"-12"and set it back down carefully to determine if it has any bad tendencies that could be corrected before the first test flight. Happy Landings