Well here we go again! 39% to 7% in an instant!! Battery is 13 months old, charged 16 times. I recharged it & it wont go above 47%, ran it down to 7%, recharged it again & only 47% with very unbalanced cells. We will see if Autel covers it, luckily i was only 10 ft. In the air this time, 3 times before that i was way out & was able to get home with less than 2% battery left. Be careful guys! You might lose your baby.