I have a battery that just will not calibrate for me. I followed the outlined procedure three times now but each time I install the battery I get the warning triangle with a message indicating that I need to do the calibration. I am able to fly with the battery without any issues, but I am concerned that it gives me the message. The 4 other batteries I have all calibrated just fine. I even attempted to reinstall the battery firmware but it indicate that it was already current. When I discharged the battery I did it in one flight from 100% to 4%. Let it cool down, then recharged to 100%. So I am at wits end on this one. Any suggestion are appreciated.