I believe that during the last firmware update of the Phantom to the latest version it automatically updated the battery that was installed in your Phantom during that process. Many of us had a message come up at about 96% that an incompatible device was detected but the message went away on it's own, I believe this was detecting the battery needed updating and it did it automatically.
I tried to update the battery I had installed when I updated to the latest firmware and it would not detect an update, that is why I believe it was done automatically. So, if you only have one battery and it was used during the latest firmware update you may already be done, just a heads up.