Cx Problem.
 

Ive been flying my CX for about a month and im pretty good at it and thinking about moving up. My brother wanted to learn to fly with it so i agreed to help him learn to fly. It was flying earlier today and he crashed it and after that it was sounding like a more high pitched noise than usual. I have had a few rashes broke the lower gear and the upper rotor hub, and i replaced it with the aluminum hub. Also the battery life sucks. Im getting like 5 minutes off my LiPos. I have one almost new one(like 5 flights) and the original one. Also the light on the 4in1 is red and at full throtle it barely lifts off the ground. The blades im using have a few minor dentsbut ive flown before on a dented pair and they flew fine. Any ideas as to what the problem is?