I had two of the HS-5485Hb installed in my Valiant flaps and after 50 flights both of the servos quit working. I took them home and tested them but to no avail. I was using an Orange RX and a 5 cell battery for all of the main airplanes servos so I don't believe the battery was putting out a maximum 6.5 volts or so. About on the 20th flight or so one of the original HS-5485HB also had some jitter which I replaced which fixed the flap problem until this last event. other servos used on the receiver/ battery system is HS-5625MG (4), S3001(1), and S3305(1). I don't believe I'll use them in new RX systems.