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Battery indication for MQTT sensors
(lemmy.world)
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One way is to make a new "entity", that's not actually linked to your previous temperature sensor. I'm not familiar with how to tie them together in a "device" like how ZigBee2mqtt auto discovery does.
So just add a new "sensor"/"entity"
Use MQTT Explorer to listen to your ZigBee2mqtt broker topic "zigbee2mqtt/temp_sala" to get the exact field name (battery, battery_state or some such)