My Ionic is semi-smart: it has excellent heart rate monitoring, OK sleep monitoring, and receives texts and notifications from my iPhone.
Here is my battery usage, which I just started tracking after what appears to have been a fluke situation, in which the battery drained quicker than normal (haven't experienced before or since...)
6/16/18, 1155 (0-100%)
6/20, 1730 (14-100)
6/25, 0920 (13-96)
6/29, 2345, 13%
6/30, 0866, 99
7/3, 1446, 42
7/3, 1650, 100
7/6, 1147, 53
7/6, 1249, 97
The first three data point were in my initial format; the time listed is when I took the Ionic off of the charger. I changed the format on 6/29, because sometimes I leave the Ionic on the charger overnight or for more than just the time needed to fully charge, which skews the time on charge info, which the only really important data point.