I have 5 Zooz door contact sensors. Model ZSE41. They've all been in service for a year or so. I changed the batteries and accidentally used dead batteries. Realizing my mistake, I swapped them all for fresh batteries. But, all 5 of these sensors are still dead.
I do see some sporadic reporting if battery, but I'm not seeing any LED lights on the sensors when I open/close. They're also unresponsive to a factory reset. Batteries all test fine, inserted correct way, etc.
It's funny you mention this. My Sonoff Zigbee motion sensors do the same thing. Never works again after a battery change. Only 3 left in service out of a dozen. I have no faith they will ever fire up after battery change.
I've replaced the batteries in my ZSE41s multiple times, with no issues. So, sorry, can't help you there. In the end @JohnRob advice matches what I would try.
Are you using a Duracell coin battery as the replacement? They have a bad tasting child coating on them. I can't get them to work in Zooz products because of the coating. Energizer works fine.
Use a nail file or sand paper on the edges and it takes it off. If you shine a bright light on the batteries you can see where the coating is vs not. I have fixed a bunch of my Duracell's like this. Issue impacts Apple AirTags also.
Yup.... although I tested that on purpose
It seems to totally block the connection, it is pretty thick when you shine a light on it. I think Duracell assumes the contact point will be in the middle of the battery and not near the edges. The coating is only near the edges. Massive fail on their part.
If my memory serves me, the board contact has no sharp edges to cut through any coating. The metal upper (neg?) contact will scratch through.
If you can taste it, maybe you can simply wash it off. Perhaps alcohol or if you have some acetone or nail polish remover it may work.
I was able to get them to work just fine in Apple Air Tags by sanding the coating off. The Zooz sensors have a pretty large contact area for both the + and -, so I am surprised it effects them at all, but maybe it lifts it up enough to not make contact in the center. Either way, if the battery has voltage there is no reason it would not work as long as its making contact by sanding off the coating.
Not sure how much comes off exactly, did not keep it in my mouth long enough, but it sure does taste bad for about 12 hours. Only the negative side also, in case anyone was wondering.
Either way, I found sand paper (or nail file) was the quickest way to remove it.
Supposedly Nintendo Switch carts have the same stuff on them if anyone is up for a taste test challenge.
See the ring near the edge, that’s the tasty stuff. I tried to sand half off and get another pic but now it’s not showing in the pic after cleaning it up. The only way I got it to work in an air tag was sanding.