Try buying a new battery

My back right propeller is stuck, what is happening is in goes a bit, then stop, while the other work fine. If I spin the gear and the cog at the same time but seperatly, it works, but then I put it together, something catches the white cog under the wing. It worked fine before, so this has not been happening when I first got it, only when it had a small crash. To be clear, I have a Cloud Rider drone, so someone please help.