I think it is more about the power required to run the lock motor.
I have several z-wave door locks as well. They all need battery replacement within a few months. Unless I don't open/close them very often. They can go much longer.
But it really isn't to big of a deal. Home Assistant tells me when they are getting low and I just swap the batteries in a few minutes.
I have the same lock. I didn't want it but it was the only lock I could find that would work on my sliding door. The key is to buy rechargeable batteries. Mine last maybe a month before they need to be replaced.