Now that I can get the battery status and voltage from my ANT+ sensors (unfortunately not from HR yet - I hope Garmin updates the CIQ capability to add HR soon), I'm creating a DF that'll provide a color-coded status screen. As an added bonus, it writes to the log file a timestamp, sensor, status and voltage once an hour, and when the status changes (eg: GOOD to OK). That'll give me an idea of the drain rate as well as the voltage thresholds when the device decides its status should be adjusted.
Such as: 14:23:17 CADENCE [34762] OK 2.76
I'm also adding value range checking. For example, if HR drops out occasionally, or returns an obviously bad value (23bpm, 250bpn, etc), I'll flag that condition so you know your sensor is acting up. Still working on the best approach to alert to a potentially bad sensor -vs- detecting normal dropouts like you've walked away from your Garmin computer (HR strap appears to drop out) or your shifting system goes to sleep because you haven't shifted in 10 mins.
I still don't have the Light Network forming in Eclipse - but I'm close to getting that last piece done. Maybe light networks are supported by the simulator. Thanks for everyone's help, especially Kurev!! Here is a draft mock-up of the screen.