V1.5.0b: On my Forerunner 245 the back-light illuminates more frequently when GarminSD is running than when the watch face is displayed.
Could this be a significant contribution to battery life (battery fell from 100% to 45% in 6 hours, so about 9 hours battery life, which is poor (ViviactiveHR has over 24 hours battery life)
@pmithrandir - do you see this?