I have a few Zigbee devices (Xiaomi Aquara sensors, temperature, humidity, …) and some keep a 100% battery level a surprising amount of time (months) - still sending realistic data.
I recently changed my Zigbee hub and some of them did not want to join anymore. I bought a new set of batteries and they joined immediately (the blue light was brighter than usual too). So that would point to a weak battery.
The problem is that they report, with this new battery, only 31%. I tested another battery - again 31%.
So either the set I bought is old (these are store-bought VARTA batteries) but that would be surprising (and also the fact that two of them show the same 31%), or the battery level indication is wrong.
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