Unstable battery level reported from Aqara VOCKQJK11LM

What happened?

Since quite a while, the battery level reported by this device is varying a lot.
As can be seen on the attached graph, it varies several times a day between 80% and 10%. This is quite annoying when you try to set an alarm to replace the batteries before it dies...

Since last week:

Since a month:

Since 2025 (older than 1 month is from long term stats):

What did you expect to happen?

I expect a rather slow and steady decrease of the battery level. Going up should result from battery replacement only.

How to reproduce it (minimal and precise)

Pair it and leave it running, observe battery level graph.

Zigbee2MQTT version

2.14.1-1

Adapter firmware version

EmberZNet 0xe0798dfffe885726 Revision: 7.4.2 [GA]

Adapter

ITEAD_SONOFF_Zigbee_3.0_USB_Dongle_Plus_V2_20221201102927

Setup

HomeAssistant add-on 2.14.1-1

Device database.db entry

{"id":6,"type":"EndDevice","ieeeAddr":"0x54ef4410001a1742","nwkAddr":25779,"manufId":4151,"manufName":"LUMI","powerSource":"Battery","modelId":"lumi.airmonitor.acn01","epList":[1],"endpoints":{"1":{"profId":260,"epId":1,"devId":1026,"inClusterList":[0,3,1280,1,1026,1029,12,64704],"outClusterList":[25],"clusters":{"genBasic":{"attributes":{"modelId":"lumi.airmonitor.acn01","appVersion":29}},"msTemperatureMeasurement":{"attributes":{"measuredValue":2304}},"msRelativeHumidity":{"attributes":{"measuredValue":6644}},"genPowerCfg":{"attributes":{"batteryVoltage":28}},"manuSpecificLumi":{"attributes":{"247":{"type":"Buffer","data":[1,33,55,11,3,40,23,4,33,168,67,5,33,54,0,6,36,97,0,0,0,0,8,33,29,1,10,33,0,0,12,32,1,100,41,254,8,101,33,190,25,102,33,94,0,103,32,1]},"airQuality":1,"displayUnit":1}},"genAnalogInput":{"attributes":{"presentValue":78}}},"binds":[{"cluster":1,"type":"endpoint","deviceIeeeAddress":"0xe0798dfffe885726","endpointID":1},{"cluster":12,"type":"endpoint","deviceIeeeAddress":"0xe0798dfffe885726","endpointID":1},{"cluster":1026,"type":"endpoint","deviceIeeeAddress":"0xe0798dfffe885726","endpointID":1},{"cluster":1029,"type":"endpoint","deviceIeeeAddress":"0xe0798dfffe885726","endpointID":1}],"configuredReportings":[{"cluster":1,"attrId":32,"minRepIntval":3600,"maxRepIntval":65000,"repChange":0},{"cluster":12,"attrId":85,"minRepIntval":10,"maxRepIntval":3600,"repChange":5},{"cluster":1026,"attrId":0,"minRepIntval":10,"maxRepIntval":3600,"repChange":100},{"cluster":1029,"attrId":0,"minRepIntval":10,"maxRepIntval":3600,"repChange":100}],"meta":{}}},"appVersion":29,"stackVersion":2,"hwVersion":1,"dateCode":"20220222","swBuildId":"2020\u0000www.","zclVersion":3,"interviewCompleted":true,"interviewState":"SUCCESSFUL","meta":{"configured":332242049,"outageCount":53},"lastSeen":1789563342232,"checkinInterval":3600}

Debug log

z2m_aqara_logs.zip

Notes

No response

Start with the attached debug log and the device database entry, especially genAnalogInput.presentValue and genPowerCfg.batteryVoltage. Trace the Aqara VOCKQJK11LM/lumi.airmonitor.acn01 device handling and verify that battery reporting no longer fluctuates unexpectedly; done means the reported level follows the device's actual battery state.