hey guys...this might be in the wrong forum but here goes

got my first RC aircraft couple of years ago, its a parkzone F27 stryker. ive flown it a lot and its been crashed a lot as well haha. Anyway the run time came way down, and the motor is not producing as much power as it used to, its so bad now I have to chuck it off a hill now to be able to fly it and once its up and running i get about a minute of run time before the motor shuts down. I figured the battery was probably stuffed so I got a new one (identical) but it did the same thing. Any ideas what might be up with it? The only problem is i can't remember when the problem first started, whether it was after a bad crash or whether it just slowly got worse over time.

Any ideas what might be up? ive ruled out the battery...so that leaves the charger and the aircraft. maybe it took one hard knock too many??

If you havent realised already I dont know much about rc aircraft or electronics...sorry

Ethan