Zwave and zwave plus

I have a Kiwkset 912. I bought the lock first, and then bought the Z-Wave daughter card on Ebay a few years later (when I got ST). I had issues in the beginning, but it's been working fine for years now (I haven't switched it over to HE yet.) I replace the batteries about once a year. Now, I live in sunny California, but 4 AA batteries once a year seems pretty good to me, considering they also have to move the deadbolt, and I've got the "Autolock after 1 minute" setting on.