@njanda, I'm not sure. There is no native Ecolink contact sensor driver that I could find in Hubitat, so I'm using the Generic Zigbee Contact Sensor driver.
Yeah that's the driver I'm using also but I would like to have something being reported for battery level just as a rough "notification"
I can say that the Sonoff contact sensors report battery level (2032 batteries). I think they were ~$7 each from Itead.
I have three of these and, no matter what I try, I cannot get them to pair with HE. Bummer.
