@MarkR , @eiolos thank you guys for all the details.
I’m choosing sensor for my smart home and wonder how long does the battery last for Xiaomi Smart Home Aqara Human Body Sensor ?
I’ve had mine for about 9 months so far and not replaced any batteries yet (they were not at 100% when I got them). They are all somewhere in the range 43% to 52%, so probably good for another 6 to 9 months depending on foot traffic.
@touliloup
I know it has been a while but are you still happy with these Kerui P829 sensors?
I have some motion sensors (which I use in conjunction with a Sonoff RF Bridge) and they have been driving me mad! The documentation says they sleep for 3 minutes after 4 activations within 3 minutes which is fine but it what it doesn’t say is that they carry on detecting motion during that 3 minutes sleep period but don’t send a signal! This means I cannot know when they will wake up so can’t set any controls in HA based on motion.
Do these sensors simply send a single signal every five seconds or every 5 minutes with no fancy sleeping?
Thanks.
These don’t go to sleep and simply send a signal as soon as a movement is detected.
I would suggest getting a conbee stick to talk to the Xiaomi zigbee stuff… This can plug directly into your HA (wherever that may be) and you can control network etc via deconz… It is way less fiddly than setting up zigbee to mqtt…
but is it ZigBee or Z-wave is i do not want to add zwave?
I see the Xiaomi Aqara Zigbee motion sensors mentioned a lot recently. Conbee is Zigbee. or there are cheaper Conbee alternatives https://www.zigbee2mqtt.io/information/supported_adapters.html
Are they zwave or zigbee? i think zwave and they are not pet immune?
I said Zigbee in the message 
They are 100% Zigbee. Definitely not ZWave.
Not sure about pets I’m afraid, though have seen some posts where people have said they angle PIRs or put tape over the lower half of the sensor to avoid picking up the animals.