Here is the sequence of events when I see a recal happening. In summary, I recognize it because there are wild fluctuations in the battery level indicator not attributable to anything else.

0. (Sometimes this step happens but not always.) At 4 bars on the battery indicator, car begins charging while accelerating or driving constant speed (green lights to left of ECO indicator). Under normal circumstances, I never see charging while driving when the battery indicator is at 4 bars.

1. Battery level indicator suddenly jumps from 3 or 4 to 6 bars, even though I have not had any major braking event to cause it to charge up like that.

2. Then after a little more driving, battery level indicator goes down to 1 bar, even though I haven't been doing anything that would obviously eat up battery charge (i.e., no stop-and-go traffic jam with AC running and windshield wipers).

3. Eventually, with braking and more charging while accelerating or driving at constant speed, it recharges to its normal 3 or 4 bar level.