Nope. I haven’t done any digging. @mike.maxwell, any thoughts on this?
Probably old firmware on the device, in any event there's nothing that we can do about it.
Any fix since this last post for the v1 sensors?
Nope. Any time I find a negative value I either replace the battery or buy a new sensor without that issue.
I've run into similar issues (not the negative battery, but unreliable sensor battery read outs, or going from reporting 60% to dying).
I've deployed the following two tactics which has made my house super reliable;
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Using Device Watch-dog, I have a battery report run every day (or 2 days can't remember) to tell me if anything has dropped below 60%
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. Using Device Watch-dog, I have a "Activity Status" report that runs every night at 1:30am. I set it so that any device I am "watching", if I don't hear from it for 48 hours, I get a notification.
#2 has saves me dozens of times, specifically for sensors that have just died when their battery reporting says they should have had more live in them (e.g. at 55%). This has been particularly true for some water sensors and my Schlage Door. Once or twice, this has also helped me learn when a device has just 'fallen off my mesh" or someone in my family has disconnected something I have plugged in (or manually turned off a switch where I have a smart bulb.
All in all, @bptworld's app has been a true difference maker in my house.