Is there a way to report the battery level of the various zwave devices?
VeraPlus, SmartThings, and Nexia all did so but I have not seen that in HA. I did not see anything in OZWCP that stood out to me so I assume there is some kind of polling going on that gets a report on the battery level.
That looks about perfect! Just one question the custom_components/battery_state.py, does that go in /home/hass/.homeassistant or in the /home/hass/deps folder?