I have notice that the battery usage differ a lot when using workout mode.
When i am free riding or racing I can go 3 hours and still have 70% battery left, but when I do a 1 hour workout I have only 30% battery left.
I tried to keep it on the map screen but that does not make a difference.
All sensors on ant+
Phone: Nexus 6P Android 8.1.0
Zwift companion app 2.2.2 (381)