I’ve returned my water leak sensor to its original location. And yes, I can still ping it from the developers portal after an hour.
Color me surprised.
I changed the battery to a Varta Lithium one tried to pair it again. It didn’t work first time, but the second time I tried to pair (and kept hitting the pairing button every second or so) it seems to finally survived the night. It states “unknown” as Manufacturer in the dev tools but I don’t mind if it does the job.
The original battery still showed 100% capacity, so I guess that can’t be trusted for battery health then.
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Thanks for giving it a go.
The battery indicators @ Homey just measures the battery millivolts, which doesn’t tell us anything about how it performs (or about its quality/health)!
Like, if that particular battery does not deliver sufficient power, or doesn’t deliver it in a steady way, especially during the pair process, the electronics or radiosignals might suffer.
About new devices with brand new batteries:
I can imagine manufacturers often don’t include the best batteries, the cheapest often win.
Not sure if Homey can discover the manufacturer?
Good that it works now.
Well, most of the time for the same sensor it detects Lumi, but not consistently 
Side-note, I’d love to be able to have a notification “when a device haven’t had any connection in X time”, so at least if/when a sensor decides to silently die I can be aware and possibly act on it. Haven’t seen this possibilty unfortunately?
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Yea I really miss a “consider device X to be offline after X hours of inactivity” option, like zigbee2mqtt has for example.
But, community comes to the rescue:
There’s a great script for checking sensor activity, probing the last status update time:
https://community.homey.app/t/a-script-to-check-sensor-last-update/63142/25
Welcome to wireless tech🤪
Also tune your wifi and zigbee channels;
In case you didn’t know already:
Any (temporary) 2.4GHz wifi signal can (temporary) ruin your zigbee signal if their frequency band overlaps:
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I went through the whole Zigbee, Wifi elimination process in the beginning (see start of thread) so I don’t suspect that is the culprit either.
One of the sensors crapped out after four days, and still with a new battery it’s playing hard to get with dropping out after an hour of being synced.
Have others recently tried to repair Aqara (prior T1/P2) sensors? I’m close to getting an Aqara 2 Hub but I guss with Homey + Hue and Aqara all running their separate Zigbee networks that is less than ideal as well…
