First I want to tell you all that I have really gotten a lot of good info and enjoy reading this forum. My problem is that I ordered a multistar 6600 LiHV. Then I sodered a pigtail together plugged it into my H and ran it out the back end and plugged into the battery. Velcoed batt. in H. Volts and everything looked good, but when I raised it to hover it flew away. Only thing I could control was up and down. I got it up over power line and down about 1/4 mile away and was able to find it undamaged with telemetry and Google map on my phone. That works great. Flew my original batt. H flew great. Try ed the LiHV again, same thing except I got it down quick, just broke a couple of props. Flew my original batt. again everything fine. The third time I try ed the LiHV I tethered the H and all it wanted to do was toilet bowl. Does anyone have any idea what the problem might be? Just trying to use a cheaper and bigger mah batt. Thanks again for all of your help.