So, it appears that the battery can be removed and the settings are saved.
On a related note, autotune seems to be sensitive to the PID settings used during the autotune session. If I start with the default PIDs, the quad will move about in a somewhat controlled manner until the tune is done and present a set of numbers. If at that point I apply the recommended PIDs, and run autotune again, the quad can get very aggressive during the autotune, and present a vastly different set of numbers.
Is there a way to use a qualified set of PIDs for the tune to achieve an optimum result? Thanks