No. There is no "indicator" nor reference in any manual.

I just learned through experimentation with volt and amp meters that repeated button presses did absolutely nothing when parked in my garage at about 40'F.

After 2 hours time, and 8 or 9 "cycles" of 8 minutes each, my HV battery did not improve, and my 12v battery did not go dead.

I doubt many people have done this, so if you wish to duplicate this experiment and see if it turns out the same for you, that would be nice to know.

-John