As I am sure you are all aware the hub V2 has 4 AA batteries for backup. Is the battery percentage available anywhere? Seems a little odd to me that it isn’t or I am missing it?
Don’t worry, it’s easy to tell, unplug the hub once a month, see if it turns off! Seriously, ST battery life estimates are terrible right now so don’t rely on them, just test regularly when you test your smoke alarms!
It would be cool to see this somewhere though. Maybe with the update they are working on to let us know when our sensors are actually off the net?