I was able to pair my eTap system with my 520 Plus. The gear related data seems to show correctly in the screens on the 520 Plus, But... there is only a single battery icon displayed. A search opf other threads showed a screen cap from an Edge 1030 that, under Settings > Sensors > 'eTap' > Sensor Details showed rows for left shifter, right shifter, front derailleur, and rear derailleur. Apparently you could navigate into each of these to see the battery level for each component. Under Sensor Details for the 520 Plus, the only think I see are my front & rear gears (allows you to change the # of teeth on the sprockets to match your setup). That's it.
Is the ability to look at individual eTap component battery status limited to the Edge 1030?