I remember that the app has shown the new battery with a capacity >3900mAh. But mostly a battery full charge or not is determined by its final voltage. I also discovered that a method which can fully charge a DJI battery. Firstly charge the battery until LED light goes out. Then discharge the battery by put it on the drone from 100% to 99%. And put the battery back to the charger at once. The battery will bypass the auto cut off function until the charger and the battery reach equilibrium. i.e. 4.35V per each cell of the battery. I use this method to charge a battery when I need a longer flight time. Even an old battery can charge upto 4.35V by using this method.
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