10 minutes is pretty short. I have four batteries and they all seem consistent. I'll get about 16-18 minutes before I get the first low battery alarm (30%), depending on how aggressively I am flying or how windy it is. My longest flight was around 21 minutes and when I set down I had 12% battery remaining. What you might want to do it let your battery run down to under 8%, let it cool down, and then give it a full charge. This will calibrate the battery gauge. If you are still only getting 10 minutes, then you may possibly have a faulty battery.