Hello,
I created this driver for my Namron Zigbee water leak sensor / Vannlekasje sensor. It reports the wet/dry state as well as battery percentage and voltage. I am sharing it here in case someone else will find it useful.
Campingvogn/Hubitat-Namron-Zigbee-Drivers: Hubitat drivers for Namrom Zigbee devices (github.com)