I have seen 3 times the invalid battery sign, always on original batteries. Until now i put contact cleaner to all the metal contacts of the battery and at the drone and the problem is solved. You have to do that regularly.
I have seen 3 times the invalid battery sign, always on original batteries. Until now i put contact cleaner to all the metal contacts of the battery and at the drone and the problem is solved. You have to do that regularly.
I have seen 3 times the invalid battery sign, always on original batteries. Until now i put contact cleaner to all the metal contacts of the battery and at the drone and the problem is solved. You have to do that regularly.