Comment by moogly

Something is wrong somewhere, because I've had ~15 of those and battery life is 16-20 months for me (I use Battery Notes in HA which keeps a timestamp since you last changed the battery so I have a pretty good view into battery life). I have not adjusted reporting thresholds/intervals in zigbee2mqtt.

They're really annoying to pair though, so I've replaced most of them with Sonoff SNZB-02P which runs a CR2477 battery and I expect the battery life to be at least 3 years; with some luck maybe 4? Not as slim however, but the built-in magnet makes up for it.