I have two Kwikset 914's in a second home. One reports battery level about 2/day, and one is reporting battery levels every 15 minutes.
The latter is way too much. I would prefer 1-2 /day at most. I cannot, however, figure out how to change that parameter. I am using the 'Generic Z-Wave Lock' device handler. Everything about it works great but if someone knows how to change battery reporting interval please let me know!