Well It just started today. I'll fly around till I hit about 70% when the battery will all of a sudden dump it's charge all the way down to 40-36%. to the point where I need to fly it back and land so it doesn't go down. I probably get about 5-7 minutes of flight time before I start hearing the warning. Not sure if the battery lost it's charge/cells but I've had no issues with the thing until now. The lights correspond with the percentage reading on the phone app, and the battery is legitimately dead.