My Walkera 5-5B is getting short flight times on two different batteries. It will fly for just a couple minutes. It is trimmed pretty well but my yaw trim is half way to the left (it wants to turn clockwise). Everything seems to be spinning freely and the gears aren't clashing.

Could I have two bad batteries? What is the best way I can troubleshoot this?

I have the same problem and I lenghthened my flybar and my flight times went back to 8 minutes. Could also be a motor going bad. Thats happened to me many times.Sometimes increasing yaw can be a sign of pending motor death.Still have not figured out the sensitivity and extent settings on the 3in1. Going to post on it again.Most people have said it makes little difference. My yaw is worse than yours, but still flies okay for now.Your batteries are probably okay.