Welcome. It depends more on the device & the batteries. Energizer lithium hold their voltage and drop dead in a hearbeat. Alkalines have a nice steady decline and will give you the best results.
The device itself will have a threshold for reporting battery level, and is not always adjustable.
For something as critical as a lock, I'd change the batteries on a schedule, like once a year, especially if it doesn't have a key backup
Thanks - the Kwikset locks change their sound (not intentional I think) when batteries are running low, so I use that and a schedule to replace batteries. Was just wondering if the reporting was accurate. My previous hub (Wink) did show changes in the battery % and I used that as a validation.
I have 2 Kwikset locks and use battery notifications from HE to let me know when they drop below 30%. I’m using Kirkland AA’s and get 6-9 months of life depending on how many auto lock cycles they go through.
I installed a Kwikset 912 Zigbee lock last October; its battery level dropped to 50% a couple of weeks ago and it is now beeping/flashing with every remote unlock also. Supposedly the 'heartbeat' LED on the interior side of the lock (which normally will periodically flash orange) is supposed to change to periodically flashing red, but its hard to tell the difference.
Sorry to revive an old thread, but when you change your batteries, have you found a process that works consistently? I have two 910 locks that I changed the batteries in. The outside keypads work fine, but they seem to have both lost communications with Hubitat and I am trying to figure out how to get them working properly again. And what I did wrong so that next time I don’t lose communications.
Thanks for the info. Do you remember how you put the batteries in? For some reason I push the lock button on outside when I slide the battery holder in (I dont remember why I started doing that, seems to me I get an alarm if I don’t). The lock mechanism closes/opens and it appears to be working properly after (all my previous codes work, etc). But then I lost communications to Hubitat so I assume I’m doing something wrong.
IIRC, that's how you force the lock to re-hand itself. (And the bolt extending and retracting is a giveaway.) In my messing around with my 910s (I've converted 2 out of 3 to Zigbee over the past couple of months,) if you mess with the lock's own control board, it makes the radio control board goofy. I'm just guessing, but that could be a reason why you lose comms with HE.
I agree with the poster immediately above, just remove and insert the battery holder without pressing buttons. I'm not sure about the alarm you're getting. Mine beeps pretty loud (just once or perhaps twice,) but it goes away quickly. I just assumed that was an 'I'm alive again!' notice.
To the original topic, my 910s seem to report battery reliably, so long as you plan to replace batteries around the 50% mark. But it's fairly linear from 100 -> 50. Like others, I just replace by sound, though I have done them preemptively once or twice when they were getting low and I knew I didn't have long to go.