New to the forum and new to drones. Have Phantom 3 4K. Bought two extra batteries from Powerextra. Both batteries perform exactly as the DJI battery that came with drone. Same flight time on all three 20-23 min. Question: In DJI Go app when I click on batt status, then advance setting It shows (cell broken). While flying I get no warnings or anything indicating a problem. I have also monitored the batt voltage while flying from full charge down to 30% or less and voltage in each cell shows the same. Do I have a problem or is the Phantom just recongnizing an after market battery. Thanks for any comments.