Having solved my wakeup problem, I'll move on to what really started my work on this (and other battery powered Z-wave motion sensors). 

This is a 4-in-1 Sensor ver 2.0, and I am using v 5.3.0 ISY994i. 

I see a 'Battery Level' on the 'Notify Sensor' node, but it always reads 100% (sometimes, and on other sensors, it is just blank). Anyway, I substituted a DC variable power supply for the battery, but I could never get any reading other than 100% for the battery level. I adjusted the supply down, incrementally, to about 2.1V at which point the sensor stopped working (ie, sensing motion). I tried normal wakeup interval, manually waking it up, and disconnecting the power and powering it back up (at the lower voltage). I suspect that this feature is just not working here, but thought I would ask anyway. 

 

If you're using lithium ion batteries they usually maintain their rated voltage then drop off rapidly when exhausted, one day they'll display a 100% then the next day it might show 70%

Thanks Techman. I'm actually well aware of the discharge characteristics of LI batteries. The problem is that the ISY is not reporting anything about it, it's simply stuck at 100%. 

 

All my LI battery operated devices also show 100% until they are about to lose their charge, then they quickly degrade and their less than 100% status will then show in the ISY

Write a program that sends you a text or email if the battery level is less than 100%. That will give you a heads up when the battery is about to fail.

Thanks, I'll give that a try.